Greddy cold weather detonation!
#1
Greddy cold weather detonation!
I run 94 octane exclusively, my timing is 14 degrees btdc, spark plugs gapped at .030" and running about 6.5 psi. Oh, and the temperature has been below freezing. Lately I've been getting slight detonation around 7000+ rpm in 2nd gear. Before it was only sometimes at the top of 3rd and 4th. It's really pissing me off! It doesn't happen all the time, though. The car runs so inconsistently. Sometimes the power is really impressive, then other times it seems slow. I'm going to install a Walbro 255 this weekend. Do you think this will help?
#4
Re: Greddy cold weather detonation! (keebler65)
because colder air is more dense than warmer air. therefore more air gets into the combustion chamber, but it is still the same amount of fuel as before it was cold outside. so it detonates. not enuf fuel for the increased amount of air. can anyone explain it better please? hopefully that helped a lil.
#7
Member
Join Date: Oct 2002
Location: phoenix, hawaii
Posts: 4,475
Likes: 0
Received 0 Likes
on
0 Posts
Re: Greddy cold weather detonation! (00TurboEX)
hmm but isnt the purpose of a intercooler too cool air, because hot air would cause detonation etc????????? otherwise if your theory is right, then a intercooler would harm a turbo setup, not help it..and youd WANT heat too get into yer intake pipe..
Trending Topics
#8
Re: Greddy cold weather detonation! (falc0n)
Nothing has been done to the fuel system other than the 310 injectors and the blue box. I've heard of other people having the same problem, but it seems to me it was at the top of 3rd and 4th. Someone mentioned that the car runs more lean in cold weather, but I don't know why.
#9
Honda-Tech Member
Join Date: Dec 2001
Location: Filthadelphia Area, PA, USA
Posts: 1,568
Likes: 0
Received 0 Likes
on
0 Posts
Re: Greddy cold weather detonation! (GOLDBERG)
hmm but isnt the purpose of a intercooler too cool air, because hot air would cause detonation etc????????? otherwise if your theory is right, then a intercooler would harm a turbo setup, not help it..and youd WANT heat too get into yer intake pipe..
Back to the topic. Do you have a way of monitoring air/fuel ratios during the time that you are detonating? Like falcon said, it seems that on all of the dyno plots that I have seen the greddy blue box makes the car run very rich. Do you have a fuel pressure gauge and fpr? Maybe you could adjust the fuel pressure up some and see if it helps.
#10
Re: Greddy cold weather detonation! (racerxadam)
Do you have a way of monitoring air/fuel ratios during the time that you are detonating? Like falcon said, it seems that on all of the dyno plots that I have seen the greddy blue box makes the car run very rich. Do you have a fuel pressure gauge and fpr? Maybe you could adjust the fuel pressure up some and see if it helps.
Like I said, this weekend I'll be installing a Walbro 255. I figure it can't hurt. I will also be drilling my stock FPR using a Dremel and a 1/32" drill bit according to the Endyne instructions.
One strange thing I've noticed about my car is that it sometimes pulls harder under part throttle.
#11
Re: Greddy cold weather detonation! (Evil Beaver)
Wow, sounds like some probs I used to have, the inconsistent power, more power at part throttle. But I don't think it's the same reason as yours. Somehow my ignition timing was retarded all the way, and once I put on the b16a2 ECU, the car got slower from 4-5k rpm's WOT. Is your ignition timing advanced? Also, my fuel pressure was way too high then (due to Walbro hi pressure 255, got an FPR and lowered fuel pressure). Maybe running rich with the blue box causes inconsistencies and it does cause the car to run really rich under boost and WOT. But that still doesn't explain the knocking.
[Modified by swrdply400mrelay, 6:30 AM 12/12/2002]
[Modified by swrdply400mrelay, 6:30 AM 12/12/2002]
#12
Re: Greddy cold weather detonation! (swrdply400mrelay)
I didn't think that the Walbro 255lph HP actually raised pressure, and is almost identical to the regular 255, but flows more efficiently at high pressures. Are you talking about the running rich at idle problem? I'm going to be ghetto and drill my stock FPR and see how that works out, instead of getting the adjustable FPR. Should be interesting!
I'm thinking about getting a MSD "Boost Timing Master." It would allow me to run stock, or maybe even advanced timing before boost, then retard the timing 1-3 degrees per pound of boost using an adjustable **** inside the car.
I'm thinking about getting a MSD "Boost Timing Master." It would allow me to run stock, or maybe even advanced timing before boost, then retard the timing 1-3 degrees per pound of boost using an adjustable **** inside the car.
#13
Honda-Tech Member
Join Date: Feb 2002
Location: SC61ville, Brooklyn, NY/TX, USA
Posts: 10,836
Likes: 0
Received 0 Likes
on
0 Posts
Re: Greddy cold weather detonation! (Evil Beaver)
I had the same problem, in 3rd after 7k too. It went away for some reason, but it sounded like little "ticks" or sand hitting my windshield. By the way, I have the same setup as you do, Stock motor,walbro 255lph, NGK 1 degree colder, and the Blue Box. Im getting Hondata installed so no more of these gay problems. Have any CEL's lately? Ive had 1, 71, 72, 73, 74, 13 ....
#14
Re: Greddy cold weather detonation! (FredoSP)
Hondata You're so lucky! I can't afford it, yet maybe I should get it before my motor is destroyed by detonation. I never get any CELs. When I first had the kit installed without the intercooler, I got 13 a few times but have been lucky otherwise.
#15
Re: Greddy cold weather detonation! (Evil Beaver)
I didn't think that the Walbro 255lph HP actually raised pressure, and is almost identical to the regular 255, but flows more efficiently at high pressures. Are you talking about the running rich at idle problem? I'm going to be ghetto and drill my stock FPR and see how that works out, instead of getting the adjustable FPR.
I say save up for a Hondata, OBDI ECU, and injectors. That's what I'm doing...
#16
Honda-Tech Member
Join Date: Jul 2001
Location: atlanta, ga, usa
Posts: 721
Likes: 0
Received 0 Likes
on
0 Posts
Re: Greddy cold weather detonation! (swrdply400mrelay)
The fuel pump will help. No doubt. I don't know if it will cure your problems but it will help. Also try retarding your base timing some untill the ping goes away.
Are you experiencing any boost creep? That would cause it too.
Are you experiencing any boost creep? That would cause it too.
#17
Re: Greddy cold weather detonation! (glagola1)
I called Greddy about it and one of the techs asked me if it was above 7000 rpms when I told him the car was detonating. So they're aware of this problem. He said it's normal because of the high compression engine and that the stock fuel pump contributes to the problem. He also mentioned getting a regulator in addition to the fuel pump and increasing the fuel pressure a little, and that I shouldn't retard the timing more than 2 degrees. I'm already 2 degrees retarded, so hopefully the fuel pump will work.
After I installed an MBC, the boost will spike close to 7.5, then settle down to 6.5. I put the MBC in for quicker spooling, not so I can crank the boost. Boost creep is something else, right?
After I installed an MBC, the boost will spike close to 7.5, then settle down to 6.5. I put the MBC in for quicker spooling, not so I can crank the boost. Boost creep is something else, right?
Thread
Thread Starter
Forum
Replies
Last Post