Just curious, what's the most you guys have seen on pump gas on a b-series motor? Lately i've done a few over 400whp and i'm wondering how far we can really go w/o water/methanol injection. Most of the cars i've done over 400whp on pump have been running for a while and none have had any problems. I used to think that over 400 was too far, but with enough timing taken out at 428whp there was no knock. I didn't want to push it any more, but i'm curious. These were 9:1 motors by the way.

 

Ill tell you monday

 

depends what kinda pump gas, in cali its 91 octane

 

forgot about cali's 91. You guys are fucked! Anyways, pump gas for most of the people is 93 octane so that's what i'm going with and what my runs were on.

 

Tony Tony hes our man, if he can't do it...noone can!

 

Can't ever count Jason out, he's king of the street cars in texas!

 

Tony, in Van Alstyne there's a pump gas for 100 octane, does that count as pump gas ?

stan

 

great topic, but when you retard the timing so much, dont the EGT's climb to unstable conditions?


Modified by Mase at 11:28 PM 9/4/2003

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</TD></TR><TR><TD CLASS="quote">great topic, but when you retard the timing so much, dont the EGT's climb to unstable conditions?</TD></TR></TABLE>
Yes

 

Just out of curiosity, how far do guys think i'm retarding it?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">Just out of curiosity, how far do guys think i'm retarding it?</TD></TR></TABLE>
Depending on how much boost. I was just saying in general retarding timing usually results in higher egts. You are the expert though Tony. I would think that if you are on pump gas and 15-18psi I guess and I don't know because I don;t do my OWN tuning yet but maybe 18 degrees? Am I off? Maybe less timing? The higher the boost I would figure lower the timing?

 

good thread.

can someone explain to me however the reason to try to get such high number on pump? we all no its un useable, i guess just so u dont have to pay the premium for c16 or others? if ur egts are climbing w/ the retarding, wouldnt it just be better overall to drop in the race gas and bring the timing up to stabilize the egts? just a question i was wondering.

 

in NC you can get 100 octane at the pump so does that count?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">forgot about cali's 91. You guys are fucked! Anyways, pump gas for most of the people is 93 octane so that's what i'm going with and what my runs were on.</TD></TR></TABLE>

damnit....91 in AZ too

 

428 is a good number. I stopped being curious at 408whp. What kind of boost pressure are you running to make those numbers and what displacement? I am .020 over and 1 bar, 91 Octane. My egt's stay below 750 degrees Celsius. I have run this setup now for about a year and a half. I think it is very reliable.

I wonder about the percieved limits myself.

 

i think we need to find some cylinder combustion pressure sensing spark plugs. We have one at school, but it is for a motorcycle engine...

 

has ANYONE on this board attempted to use supplimental propane injection on their forced 4 ?

edit: Damnit geoff that avitar is so funny.... lol

 

im gonna guess 18-20 degrees btdc

 

i havent stopped talking about it for the past cpl of weeks. i want to convert my civic to run on full propane.

 

i've been pondering this idea for quite some time, seeing as it's been done strictly for emissions purposes!

imagine running on 100% propane, AND getting lower emissions than stock!!

maybe we should post a new thread, i dont want to hijack talking about it ;-)

 

damn Tony. 428 is awesome. I guess I really need to get a bigger turbo and bring my car back to you for more tuning.

 

I'm the one Tony tuned to 428 whp and I never see egts over 650 degrees C.

 

damn only 650 C? running hella rich then?

 

seems like you have an efficient breathing machine there with egt's that low!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</TD></TR><TR><TD CLASS="quote">damn only 650 C? running hella rich then?</TD></TR></TABLE>

It running a little rich. If I hold the car at 3-5% throttle it will pop and backfire a little bit. It sounds ike a 3rd gen RX-7 .