245 Hp at the Wheels!
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245 Hp at the Wheels!
Just did my post mod dyno run. With the crawford plenum, coupe midpipe, 350 Z tube, K+N Filter Panel, and Gordgee's ground gear, I got a solid 20 Hp gain.
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
250484-winpep1.jpg
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
250484-winpep1.jpg
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Re: 245 Hp at the Wheels!
For the baseline the temp was ~50 dunno about dew point. For the post mod run it was ~70, dew point was very low that day, guess between 40-50. Altitude was effectively sea level. Cant say anything about pressure.
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
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Re: 245 Hp at the Wheels!
Well the short version is I bought the Stillen airbox and thought it was too loud. It really sounded awesome but I dont like drawing that much attention to myself.
The long story is...I first installed the ztube and stillen airbox. It roared, ran great, I could feel the power gains. Then I installed the plenum and it ran worse. Not bad it just had more punch without the plenum. So I scratched my head, talked to Doug and after ruling out vacuum leaks, we concluded it was running too lean. He had seen this on a few G's before. A TS upgrade may have solved it, dunno. Anyway, because it was loud I threw the stock airbox back in, it ran like is should have, and I was happier with the sound. So I just bought the K+N panel and called it done.
As an aside my A/F now hovers between 12.5-14.5 and is in the mid 13's at the high end. I asked Doug what he thought about the TS upgrade at this point and he said don't bother. What I might get was not worth the $500, especially since I was already pulling 245 with my mods. Doug's a good guy.
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
The long story is...I first installed the ztube and stillen airbox. It roared, ran great, I could feel the power gains. Then I installed the plenum and it ran worse. Not bad it just had more punch without the plenum. So I scratched my head, talked to Doug and after ruling out vacuum leaks, we concluded it was running too lean. He had seen this on a few G's before. A TS upgrade may have solved it, dunno. Anyway, because it was loud I threw the stock airbox back in, it ran like is should have, and I was happier with the sound. So I just bought the K+N panel and called it done.
As an aside my A/F now hovers between 12.5-14.5 and is in the mid 13's at the high end. I asked Doug what he thought about the TS upgrade at this point and he said don't bother. What I might get was not worth the $500, especially since I was already pulling 245 with my mods. Doug's a good guy.
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
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Re: 245 Hp at the Wheels!
Here's the A/F Data before someone asks...
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
250618-winpep2.jpg
G35s 6MT Garnet Fire, Premium, Aero, Aero Body Kit, Winter Sport
250618-winpep2.jpg
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From: Memphis
Re: 245 Hp at the Wheels!
I'll be putting them Crawford plenum on this weekend (if the squatters would send back their plenums!!!) with PopCharger/ Z tube combo, everything else stock....I certainly don't think the pop charger would have a negative effect but we'll see. At least I HOPE it doesn't. I've been waiting for this thing for awhile. 2 weeks after the plenum comes the Crawford headers and cats and then a sound check.
Considering your temperature when you did the base, you can be even prouder of your gains. Assuming pressure and humidity were constant, 20 degrees is a big deal.
At 50 degrees you were at 104.5% of relative HP to rated, assuming standard pressure and 68% humidity. At 70 degrees you were at 101.1% relative HP to rated assuming standard pressure and 68% humidity.
2004.5 Coupe/5AT/Ivory/Everything but chin spoiler/Z Tube-Popcharger/Crawford V5 Plenum on the way
Considering your temperature when you did the base, you can be even prouder of your gains. Assuming pressure and humidity were constant, 20 degrees is a big deal.
At 50 degrees you were at 104.5% of relative HP to rated, assuming standard pressure and 68% humidity. At 70 degrees you were at 101.1% relative HP to rated assuming standard pressure and 68% humidity.
2004.5 Coupe/5AT/Ivory/Everything but chin spoiler/Z Tube-Popcharger/Crawford V5 Plenum on the way
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Joined: Mar 2004
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From: Memphis
Re: 245 Hp at the Wheels!
Mos def. I'll also do G Tech Comp runs and compare, controlling for conditions. You're right about Doug. I like doing business with him.
2004.5 Coupe/5AT/Ivory/Everything but chin spoiler/Z Tube-Popcharger/Crawford V5 Plenum on the way
2004.5 Coupe/5AT/Ivory/Everything but chin spoiler/Z Tube-Popcharger/Crawford V5 Plenum on the way
Re: 245 Hp at the Wheels!
smcallis
Doug IS a good guy, but did you tell him what your A/F curve looks like. You are definitely going to benefit from a TS ECU update... you are running VERY lean. You are running near and even above stoichiometric 14.7 A/F point a for a good portion of your band in what should be open-loop operation. I am pretty sure that Doug would suggest otherwise if he had seem your second dyno chart (with the A/F plot). The A/F curve, aside from being lean is EXTREMELY erratic. The real A/F should start at around 13.8-14 on the very low end, go through approximately 13.5 in the midrange and reach 12.8-12.9 at readline, and it has to be a SMOOTH decrease.
Try this, disconnect both terminals of your battery, short the + and - wires together, hold for at least 5 seconds (more like 10 to be 100% effective), and reconnect the terminals. That clears all your memory and learning parameters (ECU). Then drive around hard for a few days and go back to the dyno. When you run as lean as you are, your car is prone to detonation, the ECU detects knock and retards timing (consequently reducing POWER) to keep from detonating. Pretty soon, after a pattern of detonations, the adaptive timing system will retard timing 'for good' (so to speak, until your reset the ECU). Your top end should be stronger that it is now.
Take the above as you wish, but is is FACT that your A/F is doing weird things, and it is FACT that you are, at least for certain portions of your rpm band, running lean.
Gurgen
P.S. Sorry for the typos, i am terribly in a hurry.
<P ID="edit"><FONT class="small"><EM>Edited by gurgenpb on 05/12/04 08:18 PM.</EM></FONT></P>
Doug IS a good guy, but did you tell him what your A/F curve looks like. You are definitely going to benefit from a TS ECU update... you are running VERY lean. You are running near and even above stoichiometric 14.7 A/F point a for a good portion of your band in what should be open-loop operation. I am pretty sure that Doug would suggest otherwise if he had seem your second dyno chart (with the A/F plot). The A/F curve, aside from being lean is EXTREMELY erratic. The real A/F should start at around 13.8-14 on the very low end, go through approximately 13.5 in the midrange and reach 12.8-12.9 at readline, and it has to be a SMOOTH decrease.
Try this, disconnect both terminals of your battery, short the + and - wires together, hold for at least 5 seconds (more like 10 to be 100% effective), and reconnect the terminals. That clears all your memory and learning parameters (ECU). Then drive around hard for a few days and go back to the dyno. When you run as lean as you are, your car is prone to detonation, the ECU detects knock and retards timing (consequently reducing POWER) to keep from detonating. Pretty soon, after a pattern of detonations, the adaptive timing system will retard timing 'for good' (so to speak, until your reset the ECU). Your top end should be stronger that it is now.
Take the above as you wish, but is is FACT that your A/F is doing weird things, and it is FACT that you are, at least for certain portions of your rpm band, running lean.
Gurgen
P.S. Sorry for the typos, i am terribly in a hurry.
<P ID="edit"><FONT class="small"><EM>Edited by gurgenpb on 05/12/04 08:18 PM.</EM></FONT></P>
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From: Memphis
Re: 245 Hp at the Wheels!
Good point gurgen. Why could he be running so lean in the first place?
smcallis, what's up with the erratic and very lean A/F mixture? I've never dynoed, is that normal?
2004.5 Coupe/5AT/Ivory/Everything but chin spoiler/Z Tube-Popcharger/Crawford V5 Plenum on the way
smcallis, what's up with the erratic and very lean A/F mixture? I've never dynoed, is that normal?
2004.5 Coupe/5AT/Ivory/Everything but chin spoiler/Z Tube-Popcharger/Crawford V5 Plenum on the way