Downpipe & Exhaust dyno sheet

1184 Views 13 Replies 5 Participants Last post by JS4KIKZ, Jan 22, 2002

JS4KIKZ

Discussion Starter · Jan 21, 2002

Ok. I just dyno'd today. I have the HKS titanium 4" exhaust, 3" RMM downpipe, boost gauge, trac fuse removed, T-bleeder mod, TRD air filter, automatic '95 TT. A lot of the time, during the higher RPM's, i have a lot of miss and backfire. Im assuming that Im running rich, and forgot to ask for a wideband O2 sensor to be hooked up. I know I am in dire need of a fuel controller and boost gauge. Well, here's my dyno sheet, and as you can tell, you can see how it jumps up and down, and tell that I've got problems. Any imput and/or advice is very welcomed.

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Tommy Nim

· #2 · Jan 21, 2002

this was also with no ice and 93 octane.

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· #3 · Jan 21, 2002

First of all, it is very obvious the missing is killing all power. Gap the plugs down to .035 and try again. If it still misses, try .032, and so on. Yes, it's running rich, but that's not the main problem. Your plug gap is too large - it's a very common problem.

Second, get a boost gauge ASAP. It's very hard to hurt the 2JZGTE on stock turbos, but the gauge will help in figuring out what your car is doing.

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· #4 · Jan 21, 2002

The car has a boost gauge in it.
It peaks at 23psi but holds at 18-20psi at WOT.

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JS4KIKZ

Discussion Starter · #5 · Jan 21, 2002

I have the NGK 3330's and they are gappped at .032 and I have a boost gauge. The boost seems almost constant except for all the backfirng.

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· #6 · Jan 21, 2002

You're pushing 18-23lbs of boost and only dyno'ing 300hp and torque?

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JS4KIKZ

Discussion Starter · #7 · Jan 21, 2002

Ummmmmm.yeah... Thats what I said. Also, like I said, I am in dire need of a fuel controller and I need to get a wideband O2 sensor to tell me if Im running rich or lean. But, I have other problems I have to deal with first.

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T66Dawg

· #8 · Jan 21, 2002

Timing retard.......

On the dyno you NEED to have some race fuel as the stock intercooler is USELESS with the car just sitting there and just a fan(s) blowing on it........

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JS4KIKZ

Discussion Starter · #9 · Jan 21, 2002

Is that why it jumped around so much? I know it studders a little in the higher RPM's but not as much as it did on the dyno. Thanx

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Tommy Nim

· #10 · Jan 21, 2002

i told you sooooo...hehe.

JS4KIKZ said:
Is that why it jumped around so much? I know it studders a little in the higher RPM's but not as much as it did on the dyno. Thanx

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Silver Orchid SP60

· #11 · Jan 21, 2002

The boost level is too high for 93 octane. Being on the dyno made it worse because the intercooler not getting air. You would have made more power if u turned the boost down because u would not be getting timing retard. It makes a big difference. On a 99.8 degree day I was making 560rwhp on the dyno. I had 100 octance but not enough. The next time it was much cooler and I had 116 mixed with pump. I made 640 rwhp because I was not getting any timing retard.

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T66Dawg

· #12 · Jan 21, 2002

Yes.

JS4KIKZ said:
Is that why it jumped around so much? I know it studders a little in the higher RPM's but not as much as it did on the dyno. Thanx

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Ray745

· #13 · Jan 22, 2002

you didnt mention if you had any type of boost cut controller... do you?

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JS4KIKZ

Discussion Starter · #14 · Jan 22, 2002

Yup, Greddy BCC

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