turbo SOhc won't rev !!!
Thread Starter
Joined: Apr 2002
Posts: 922
Likes: 0
From: Lakeland, FL, U.S.
turbo SOhc won't rev !!!
Well, My car is a total mutt. And its had this problem for a long time, but I've just delt with it.
Most of the time it won't rev past 6000rpms. Sometimes its 5700ish, sometimes its 6300ish.
I've been blaming it on tuning this whole time, but I've leaned it out on the AFC and richened it up and it doesn't make any difference...
My plugs are gapped at .32, I've tried two different sets of plug wires. My dizzy timing is just barely below stock.
The ECU is a "run of the mill" '91 PM6 ( no chips ).
Of course I wait till its warmed up to hammer on it. And the car manigaed a 14.6@96mph with a 2.3 60'FT. short shifting like this at 10psi. The AFC monitors the tach so I know is accurate.
Think Maybe the timing belt might be off a tooth ? The car pulls harder then Jenna Jamison from 2300rpms to about 5600, then craps out...
Just looking for some suggestions. The plugs are almost always black when I check them, but I also let the car idle for a while before shutting it down.
Stealth TT fuel pump
DSM injectors 450cc
Stock FPR
Even with the boost around 5psi it will cut-out, like its missing, not like hitting the limiter.
Most of the time it won't rev past 6000rpms. Sometimes its 5700ish, sometimes its 6300ish.
I've been blaming it on tuning this whole time, but I've leaned it out on the AFC and richened it up and it doesn't make any difference...
My plugs are gapped at .32, I've tried two different sets of plug wires. My dizzy timing is just barely below stock.
The ECU is a "run of the mill" '91 PM6 ( no chips ).
Of course I wait till its warmed up to hammer on it. And the car manigaed a 14.6@96mph with a 2.3 60'FT. short shifting like this at 10psi. The AFC monitors the tach so I know is accurate.
Think Maybe the timing belt might be off a tooth ? The car pulls harder then Jenna Jamison from 2300rpms to about 5600, then craps out...
Just looking for some suggestions. The plugs are almost always black when I check them, but I also let the car idle for a while before shutting it down.
Stealth TT fuel pump
DSM injectors 450cc
Stock FPR
Even with the boost around 5psi it will cut-out, like its missing, not like hitting the limiter.
Joined: Jan 2004
Posts: 159
Likes: 0
Re: turbo SOhc won't rev !!! (89dxhunchback)
bro,
just some thoughts.
1, turbo charged on a stock exhaust?... thats one problem.
2, hollowed cat. empty boxes causes flow stagnation and flow velocity.
consider upgrading if you havent already..
just some thoughts.
1, turbo charged on a stock exhaust?... thats one problem.
2, hollowed cat. empty boxes causes flow stagnation and flow velocity.
consider upgrading if you havent already..
Thread Starter
Joined: Apr 2002
Posts: 922
Likes: 0
From: Lakeland, FL, U.S.
Re: turbo SOhc won't rev !!! (89dxhunchback)
Also just thought of something else it "could be". My D16A6 over heated after the head bolts lifted and warpped it, so I just switched back to my old D15B2 head which is the same casting, just different valve springs and a VERY VERY VERY slightly different cam.
The head I'm using saw 9 bottles of nitrous and never thought twice about revving to redline....
But it is harder for the intake valves to close under boost.... I wonder...
What do you guys think ?
The head I'm using saw 9 bottles of nitrous and never thought twice about revving to redline....
But it is harder for the intake valves to close under boost.... I wonder...
What do you guys think ?
Thread Starter
Joined: Apr 2002
Posts: 922
Likes: 0
From: Lakeland, FL, U.S.
Re: turbo SOhc won't rev !!! (FlexW99)
Thanx for the thought, but currently its running open DP... The track times were on stock exhuast and its always ran though stock exhuast until last Thrusday, I was on the interstate and hammered it, the clamp came loose and left me with open DP until I get around to caring ( its so much faster without the exhuast, hehe ).
I'm looking into making a cable that can be tightened during "racing time" and loosened a bit under daily driving conditions. I filled the two side motor mounts, but I guess that wasn't enough to stop the engine from torquing enough to pull my exhuast loose.
Thanx for the shoot though.
I'm looking into making a cable that can be tightened during "racing time" and loosened a bit under daily driving conditions. I filled the two side motor mounts, but I guess that wasn't enough to stop the engine from torquing enough to pull my exhuast loose.
Thanx for the shoot though.
Thread Starter
Joined: Apr 2002
Posts: 922
Likes: 0
From: Lakeland, FL, U.S.
Re: (O.G.RENR)
Idle TPS via the AFC is .045-.050 ( maybe a zero or so off ). I tried switching my 89 CRX Si eCu into it a few times, but it didn't make a difference. I have a spare dizzy, so I guess I could try that ( which would answer the coil/ignitor question ), the bad news for me is that my dizzy wires are "hard wired" to the dizzy, meaning I have no connectors since my car was a DPFI car about 2+ years ago.
But maybe that could be it...
Its not like hitting the rev limiter at all, its like its "missing".
Also thought I should meantion that the Speedo doesn't work due to a greeked out cable or something, but I can't see how that would effect rpm.
But maybe that could be it...
Its not like hitting the rev limiter at all, its like its "missing".
Also thought I should meantion that the Speedo doesn't work due to a greeked out cable or something, but I can't see how that would effect rpm.
Trending Topics
Thread Starter
Joined: Apr 2002
Posts: 922
Likes: 0
From: Lakeland, FL, U.S.
Re: (91civicDXdude)
I don't even own a timing light... I know the stock dizzy placement and I just dropped down a few degrees from there.
I'll check the TPS, but I've replaced TPS on 3 different cars, I know about the voltage deal. I also know it will throw a code supe fast if its not corect, but no less I'll take a look.
Maybe I should own a timing light, hehe.
Reason # 873 that low compression is better on a daily driven car with a HMT, hehe.
I'll check the TPS, but I've replaced TPS on 3 different cars, I know about the voltage deal. I also know it will throw a code supe fast if its not corect, but no less I'll take a look.
Maybe I should own a timing light, hehe.
Reason # 873 that low compression is better on a daily driven car with a HMT, hehe.
Member
Joined: May 2004
Posts: 1,302
Likes: 0
From: SHAPE, Belgium, Im really American
Re: (89dxhunchback)
You could be floating your valves at high rpm. The springs may not have enough tension on them to shut the valves as you were saying, either that or the valves/seats may be hosed after the NOS.
Honda-Tech Member
Joined: Dec 2003
Posts: 1,224
Likes: 0
From: boringville, FL
i had a similar problem with my z6 it would like stop revving at 7k it wound up being the cam timing was +4 but now its at 0 and pulls all the way to 7800. bte i think i talked to you at track thurs had maroon hatch with the starion fmic and the hood scoops?
Thread Starter
Joined: Apr 2002
Posts: 922
Likes: 0
From: Lakeland, FL, U.S.
Re: (Bserieskllr)
Yep. that was me. I had other "issues" that day.
#1 new IC piping didn't wanna stay on
#2 wastegate was being stupid. either 6psi at redline or 15psi at 2800rpms.
My best time was at half throttle running 15.6, hehehe.
I'm going to try the dizzy thing, and if that doesn't do it, I'm going to either get my Si head decked or seek out one from some of my friends.
#1 new IC piping didn't wanna stay on
#2 wastegate was being stupid. either 6psi at redline or 15psi at 2800rpms.
My best time was at half throttle running 15.6, hehehe.
I'm going to try the dizzy thing, and if that doesn't do it, I'm going to either get my Si head decked or seek out one from some of my friends.
Re: (crx_88_si)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crx_88_si »</TD></TR><TR><TD CLASS="quote">both are fine.
0.5v 0% throttle
4.5v 100% throttle
I would try a MAP sensor next.. lmao, trial and error sucks huh.</TD></TR></TABLE>
this is what i have...
.5v at idle
and 4.53 at 100%
u might be abit off at the top end which makes sense because thats where your having problems at. its just something ot try out. did u ever have to remove the tps or change the throttle body? it might just need a small adjustment...shouldt take u more that 15minutes to adjust and test out.
0.5v 0% throttle
4.5v 100% throttle
I would try a MAP sensor next.. lmao, trial and error sucks huh.</TD></TR></TABLE>
this is what i have...
.5v at idle
and 4.53 at 100%
u might be abit off at the top end which makes sense because thats where your having problems at. its just something ot try out. did u ever have to remove the tps or change the throttle body? it might just need a small adjustment...shouldt take u more that 15minutes to adjust and test out.
Joined: Jan 2004
Posts: 1,055
Likes: 0
From: Texas, USA
Re: (O.G.RENR)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 89dxhunchback »</TD></TR><TR><TD CLASS="quote">Well, My car is a total mutt. And its had this problem for a long time, but I've just delt with it.
Most of the time it won't rev past 6000rpms. Sometimes its 5700ish, sometimes its 6300ish.
I've been blaming it on tuning this whole time, but I've leaned it out on the AFC and richened it up and it doesn't make any difference...
My plugs are gapped at .32, I've tried two different sets of plug wires. My dizzy timing is just barely below stock.
The ECU is a "run of the mill" '91 PM6 ( no chips ).
Of course I wait till its warmed up to hammer on it. And the car manigaed a 14.6@96mph with a 2.3 60'FT. short shifting like this at 10psi. The AFC monitors the tach so I know is accurate.
Think Maybe the timing belt might be off a tooth ? The car pulls harder then Jenna Jamison from 2300rpms to about 5600, then craps out...
Just looking for some suggestions. The plugs are almost always black when I check them, but I also let the car idle for a while before shutting it down.
Stealth TT fuel pump
DSM injectors 450cc
Stock FPR
Even with the boost around 5psi it will cut-out, like its missing, not like hitting the limiter.</TD></TR></TABLE>
ditch the AFC and get turboedit... see if your problems are still there; also maybe get a wideband and see what your fuel is doing. it may be running so rediculously rich that its bogging at those rpms.
when i put my 450's in my d16a6 turbo i was just using the stock turboedit map built for a B18; and the d16 doesn't move hardly as much air as a b18 so yeah it was running hellaciously rich! It would bog at anything over 4psi and around 4000rpms. Felt almost like i was hitting some sort of boost cut, but it wasn't; just a tubload of fuel :D
Most of the time it won't rev past 6000rpms. Sometimes its 5700ish, sometimes its 6300ish.
I've been blaming it on tuning this whole time, but I've leaned it out on the AFC and richened it up and it doesn't make any difference...
My plugs are gapped at .32, I've tried two different sets of plug wires. My dizzy timing is just barely below stock.
The ECU is a "run of the mill" '91 PM6 ( no chips ).
Of course I wait till its warmed up to hammer on it. And the car manigaed a 14.6@96mph with a 2.3 60'FT. short shifting like this at 10psi. The AFC monitors the tach so I know is accurate.
Think Maybe the timing belt might be off a tooth ? The car pulls harder then Jenna Jamison from 2300rpms to about 5600, then craps out...
Just looking for some suggestions. The plugs are almost always black when I check them, but I also let the car idle for a while before shutting it down.
Stealth TT fuel pump
DSM injectors 450cc
Stock FPR
Even with the boost around 5psi it will cut-out, like its missing, not like hitting the limiter.</TD></TR></TABLE>
ditch the AFC and get turboedit... see if your problems are still there; also maybe get a wideband and see what your fuel is doing. it may be running so rediculously rich that its bogging at those rpms.
when i put my 450's in my d16a6 turbo i was just using the stock turboedit map built for a B18; and the d16 doesn't move hardly as much air as a b18 so yeah it was running hellaciously rich! It would bog at anything over 4psi and around 4000rpms. Felt almost like i was hitting some sort of boost cut, but it wasn't; just a tubload of fuel :D
Thread Starter
Joined: Apr 2002
Posts: 922
Likes: 0
From: Lakeland, FL, U.S.
Re: (crx_88_si)
WOT is -40 across the band
Narrow is -50 idle, -47 2000rpms, and -40 across the rest.
The fuel is I've been blaming it on over the last 4-6months, but I've tried leaning and richening it where it starts to "miss".
The A/F guage is about as usless as it gets. It kept saying that I was running lean so I added fuel with the AFC, and the at about -34 across WOT it started to not even wanna run in boost at all, so I added the Stealth TT fuel pump and that made it even worse. Now my A/F guage is saying I'm "off the chart" lean and the plugs are still caked up with black crap.
I also tried adding my AFPR ( the B&M one) and the car ran like poo at the same idle psi, so I took it off.
Sometimes I think I should take it to the dyno, but it would blow to pay them all that money and it NOT be the tuning....
The engine has ARP head studs @ 80FT LBS. and low compression, so head gaskets shouldn't be a problem.
If the TPS is set correctly and reading properly, then I can't imagine the Throttle cable could be doing and harm.
Dizzy
Valve springs
Tuning
Narrow is -50 idle, -47 2000rpms, and -40 across the rest.
The fuel is I've been blaming it on over the last 4-6months, but I've tried leaning and richening it where it starts to "miss".
The A/F guage is about as usless as it gets. It kept saying that I was running lean so I added fuel with the AFC, and the at about -34 across WOT it started to not even wanna run in boost at all, so I added the Stealth TT fuel pump and that made it even worse. Now my A/F guage is saying I'm "off the chart" lean and the plugs are still caked up with black crap.
I also tried adding my AFPR ( the B&M one) and the car ran like poo at the same idle psi, so I took it off.
Sometimes I think I should take it to the dyno, but it would blow to pay them all that money and it NOT be the tuning....
The engine has ARP head studs @ 80FT LBS. and low compression, so head gaskets shouldn't be a problem.
If the TPS is set correctly and reading properly, then I can't imagine the Throttle cable could be doing and harm.
Dizzy
Valve springs
Tuning
Joined: Jan 2004
Posts: 1,055
Likes: 0
From: Texas, USA
Re: (89dxhunchback)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 89dxhunchback »</TD></TR><TR><TD CLASS="quote">WOT is -40 across the band
Narrow is -50 idle, -47 2000rpms, and -40 across the rest.
The fuel is I've been blaming it on over the last 4-6months, but I've tried leaning and richening it where it starts to "miss".
The A/F guage is about as usless as it gets. It kept saying that I was running lean so I added fuel with the AFC, and the at about -34 across WOT it started to not even wanna run in boost at all, so I added the Stealth TT fuel pump and that made it even worse. Now my A/F guage is saying I'm "off the chart" lean and the plugs are still caked up with black crap.
I also tried adding my AFPR ( the B&M one) and the car ran like poo at the same idle psi, so I took it off.
Sometimes I think I should take it to the dyno, but it would blow to pay them all that money and it NOT be the tuning....
The engine has ARP head studs @ 80FT LBS. and low compression, so head gaskets shouldn't be a problem.
If the TPS is set correctly and reading properly, then I can't imagine the Throttle cable could be doing and harm.
Dizzy
Valve springs
Tuning</TD></TR></TABLE>
bad injector? bad map sensor? bad tps sensor?
you definateley have a bad o2 sensor; get a wideband or borrow one if you're serious about tuning your car. also chip the damn ecu AFC hacks are crap and you're probably detonating pushing 10psi of boost with the stock timing maps (not retarded under boost)
also do you get any CEL's under boost? your ecu may be seeing too much voltage throwing itself into limp mode; a pm6/ps9 in limp mode with 450cc injectors will run hella rich over 3krpm; so much so the car won't run right.
Narrow is -50 idle, -47 2000rpms, and -40 across the rest.
The fuel is I've been blaming it on over the last 4-6months, but I've tried leaning and richening it where it starts to "miss".
The A/F guage is about as usless as it gets. It kept saying that I was running lean so I added fuel with the AFC, and the at about -34 across WOT it started to not even wanna run in boost at all, so I added the Stealth TT fuel pump and that made it even worse. Now my A/F guage is saying I'm "off the chart" lean and the plugs are still caked up with black crap.
I also tried adding my AFPR ( the B&M one) and the car ran like poo at the same idle psi, so I took it off.
Sometimes I think I should take it to the dyno, but it would blow to pay them all that money and it NOT be the tuning....
The engine has ARP head studs @ 80FT LBS. and low compression, so head gaskets shouldn't be a problem.
If the TPS is set correctly and reading properly, then I can't imagine the Throttle cable could be doing and harm.
Dizzy
Valve springs
Tuning</TD></TR></TABLE>
bad injector? bad map sensor? bad tps sensor?
you definateley have a bad o2 sensor; get a wideband or borrow one if you're serious about tuning your car. also chip the damn ecu
AFC hacks are crap and you're probably detonating pushing 10psi of boost with the stock timing maps (not retarded under boost)also do you get any CEL's under boost? your ecu may be seeing too much voltage throwing itself into limp mode; a pm6/ps9 in limp mode with 450cc injectors will run hella rich over 3krpm; so much so the car won't run right.