Finally finished the turbo on my N/A!!! (Some info...)
Rotary Enthusiast
Joined: Apr 2001
Posts: 974
Likes: 0
From: Mississauga
I many have said this and many have told me but, BE CAREFUL!!!!!!
I have 4 550s, rewired t2 fuel pump and running 10psi boost on an S5 turbo motor and ive heard detonation around 10psi / 6krpm. Im really surprised you arent hearing it since youre leaning it out still. I wont push my car hard anymore untill i get at least teh walbro in. then go 680s and safc.
I have 4 550s, rewired t2 fuel pump and running 10psi boost on an S5 turbo motor and ive heard detonation around 10psi / 6krpm. Im really surprised you arent hearing it since youre leaning it out still. I wont push my car hard anymore untill i get at least teh walbro in. then go 680s and safc.
Rotary Freak
Joined: Dec 2001
Posts: 2,941
Likes: 1
From: sandiego, ca
Bambam? What was the total cost? We need a sticky with pictures bambam. I will try this on my N/A when Im done with it. It looks like its going to be one of the fastes on here real soon...So turboeing will be next.
Thread Starter
I came, I saw, I boosted.
Joined: Apr 2001
Posts: 1,921
Likes: 0
From: Windsor, Ontario, Canada
I've heard it a few times...
I doubt I'm leaning out....
I have 4 550s, a TII pump, and an S-AFC, set about 10% rich...
I have only heard it when I have a heavy passenger.
The timing is backed off about 3-4 degrees (kills power around 1K rpms though!)
I've richened it up to the point where I don't hear any detonation.. so it should be OK.
The stock o2 sensor is useless, it's all over the place!
Bad news though... I have a weak apex seal on my rear rotor, it's been a little low for quite a while, but lately its been getting worse, compression is down to about 30/30/95.
(95 being where both rotors are at stock max when I got the 3mm seals) The front is fine.
It still runs fine, but the idle is getting a tad lumpy, and I can notice a little loss of low end power.
I'm going to have to yank it and replace that seal, probably in the spring.
I might replace the rotors with lower compression S4 N/A ones.... but I'd like to keep my 3mm seals on these rotors... we'll see when the engine is apart. Hopefully the housing isn't scored either..
I doubt I'm leaning out....
I have 4 550s, a TII pump, and an S-AFC, set about 10% rich...
I have only heard it when I have a heavy passenger.
The timing is backed off about 3-4 degrees (kills power around 1K rpms though!)
I've richened it up to the point where I don't hear any detonation.. so it should be OK.
The stock o2 sensor is useless, it's all over the place!
Bad news though... I have a weak apex seal on my rear rotor, it's been a little low for quite a while, but lately its been getting worse, compression is down to about 30/30/95.
(95 being where both rotors are at stock max when I got the 3mm seals) The front is fine.
It still runs fine, but the idle is getting a tad lumpy, and I can notice a little loss of low end power.
I'm going to have to yank it and replace that seal, probably in the spring.
I might replace the rotors with lower compression S4 N/A ones.... but I'd like to keep my 3mm seals on these rotors... we'll see when the engine is apart. Hopefully the housing isn't scored either..
Thread Starter
I came, I saw, I boosted.
Joined: Apr 2001
Posts: 1,921
Likes: 0
From: Windsor, Ontario, Canada
Naw, there was always a little blip on the one seal, almost right since the rebuild 2 years ago.... (might have been my 1 kilometer break in period (heheheh) but not much off... like 95/90/90 compression.
The difference was so minute I never thought anything about it.. but I guess it was weak, so the boost and a few pings took it out.
It's probably just cracked or something, since it still has some compression. It's not stuck.. I've soaked it in ATF overnight, and no difference. I just hope the housing is OK. (Should be, since I'm still getting one full compression pulse)
The difference was so minute I never thought anything about it.. but I guess it was weak, so the boost and a few pings took it out.
It's probably just cracked or something, since it still has some compression. It's not stuck.. I've soaked it in ATF overnight, and no difference. I just hope the housing is OK. (Should be, since I'm still getting one full compression pulse)
Kill Bear
Joined: Feb 2001
Posts: 106
Likes: 0
From: Asheville, NC
Originally posted by Bambam7
Naw, there was always a little blip on the one seal, almost right since the rebuild 2 years ago.... (might have been my 1 kilometer break in period (heheheh)
Naw, there was always a little blip on the one seal, almost right since the rebuild 2 years ago.... (might have been my 1 kilometer break in period (heheheh)
I'm still sleepy so I might not be thinking right.
Thread Starter
I came, I saw, I boosted.
Joined: Apr 2001
Posts: 1,921
Likes: 0
From: Windsor, Ontario, Canada
Well, I think the 4 550's should be adequate. I DO have an S-AFC too. (Making the pump the limiting factor)
My mods, from a turbo perspective, aren't that extensive.
If you consider my car a TII, the mods (only requiring extra fuel are listed- I have tons others of course) are as follows.
No emmisions controls
TID mod/cone filter
2 1/4" catback
No main cat
Streetport
OK- that's a mildly modded TII
The advantage I have, is that there is no fuel cut in the ECU, allowing 10psi of boost.
ALso, of course, is the higher compression, which is the real boost of power over a standard TII. 10psi on my car might make 230 hp at the wheels, where a standard TII (stock turbo of course) with my mods might be more like 200 rwhp. To bad about that whole detonation thing...
But anyways, back on topic...
In a stock car, I don't think the injectors see more than a 50-60% duty cycle max.
I'm pretty sure that I could boost my fuel output by 30% or more with the S-AFC before the fuel pump couldn't keep up anymore, and I've heard that the stock pump (with rewire) is good to at least 250hp minimum.
That's right about where I am.
When the engine is rebuilt, I'm definatly getting a fuel pressure gauge, and putting my wideband in.
My mods, from a turbo perspective, aren't that extensive.
If you consider my car a TII, the mods (only requiring extra fuel are listed- I have tons others of course) are as follows.
No emmisions controls
TID mod/cone filter
2 1/4" catback
No main cat
Streetport
OK- that's a mildly modded TII
The advantage I have, is that there is no fuel cut in the ECU, allowing 10psi of boost.
ALso, of course, is the higher compression, which is the real boost of power over a standard TII. 10psi on my car might make 230 hp at the wheels, where a standard TII (stock turbo of course) with my mods might be more like 200 rwhp. To bad about that whole detonation thing...
But anyways, back on topic...
In a stock car, I don't think the injectors see more than a 50-60% duty cycle max.
I'm pretty sure that I could boost my fuel output by 30% or more with the S-AFC before the fuel pump couldn't keep up anymore, and I've heard that the stock pump (with rewire) is good to at least 250hp minimum.
That's right about where I am.
When the engine is rebuilt, I'm definatly getting a fuel pressure gauge, and putting my wideband in.
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