SR Dyno and Drag Question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

-=RS13=- · 12-28-2005, 07:19 PM

Hey everyone first post have been on here a while.

So i have recently done an SR swap into my S13.
My mods are
S13 SR20DET
FMIC
Fuel Pump
Boost Controller (14 PSI)
Full exhasut Turbo extention and back
Apexi Filter

However i ran it at the track @ approx 2500 Feet above sealevel and i ran this

60' 2.560
1/8 8.952
1/4 13.521
MPH 105.80

This was on All-season 195/55R15 tires that were basicly bald as you can see by my 60 foot times.

I dyno's at 256 HP and 268 TQ. This was at the same altitude and on a dynojet.

The only question i have is that most SR's around me run closer to a 13.9 and dyno at 240 is @ 14 PSI. My friend with a GT25R, cams, inkake mani and a power FC only ran a 13.8. My motor has 180 compression across the board and on the dyno the AF's were 12.5:1 at the lowest but it did not matter how much boost i ran they all had simmilar AF's.

Does anyone have any explanations for why. Or is my motor the only normal one

kuramaya · 12-28-2005, 07:49 PM

The reason could be you launch better than them. Your AFR should be 11.5:1 -12:1 but closer to 11.5:1 You are running Lean.

wootwoot · 12-28-2005, 08:49 PM

I dont know how you are managing to get such terrible 60 foots!!! Not to be rude or anything but I mean those are TERRIBLE. I had a 2.33 60 foot on Michelin MXV4 plus' which are also allseason and have a 450 trear wear I think. You should be amazed at that car running a 13.6 with those launches! With drag radials and a good driver that would have been a possible high 12 second pass. I would honestly turn the boost down to 12psi to be safe though. Those afr's are not preferable so watch it there bud. Those numbers even see higher than normal to me as well....

-=RS13=- · 12-29-2005, 12:16 AM

Hey
It is hard with shot subframe bushings and 1 wheel peel. I know it is brutal and i know i should be 12's but does that sound normal on a stock SR at 2500 feet above sealevel.

ANd here is the air/fuel chart. It was on an Ethanol blend with usualy reads aobut 1 point leaner, or so i have been told. There was not a single ping or any detonation.

EDIT: all most all of my other 60 foot times were 2.2 -2.35 but my times were 13.6-13.8

Silverbullet · 01-01-2006, 08:35 PM

thats some high compression... according to the FSM the compression is 155psi from the factory. Over time, it should go down slightly. 256WHP is also really really good. Most motors will get 230-240whp with 14psi and same bolt ons.

your motor sounds special.

wootwoot · 01-01-2006, 10:25 PM

I forgot I had a lsd;whoops!

smithers584 · 01-02-2006, 12:00 AM

he is right about the compression, but for some reason most of the sr's i see have about 165-170 across. i dont know why, im at sea level with all your mods and a few more and i cant break 240 hp or torque. my compression ran 165 across. i didnt go cheap either, all my bolt ons are apexi, hks, greddy, or sard and i spent a few hours dyno tuning with my mechanic. sounds like you got a badass motor, get some slicks and some lower 60's and you be set.

12-28-2005, 07:19 PM	#1
-=RS13=- Leaky Injector Join Date: Jan 2004 Location: Canada Age: 38 Posts: 122 Trader Rating: (0) Feedback Score: 0 reviews	SR Dyno and Drag Question Hey everyone first post have been on here a while. So i have recently done an SR swap into my S13. My mods are S13 SR20DET FMIC Fuel Pump Boost Controller (14 PSI) Full exhasut Turbo extention and back Apexi Filter However i ran it at the track @ approx 2500 Feet above sealevel and i ran this 60' 2.560 1/8 8.952 1/4 13.521 MPH 105.80 This was on All-season 195/55R15 tires that were basicly bald as you can see by my 60 foot times. I dyno's at 256 HP and 268 TQ. This was at the same altitude and on a dynojet. The only question i have is that most SR's around me run closer to a 13.9 and dyno at 240 is @ 14 PSI. My friend with a GT25R, cams, inkake mani and a power FC only ran a 13.8. My motor has 180 compression across the board and on the dyno the AF's were 12.5:1 at the lowest but it did not matter how much boost i ran they all had simmilar AF's. Does anyone have any explanations for why. Or is my motor the only normal one

12-28-2005, 07:49 PM	#2
kuramaya Nissanaholic! Join Date: Dec 2004 Location: 沖縄 , Japan Age: 52 Posts: 1,677 Trader Rating: (1) Rides Gallery: kuramaya Feedback Score: 1 reviews	The reason could be you launch better than them. Your AFR should be 11.5:1 -12:1 but closer to 11.5:1 You are running Lean. __________________ ZEROYON WEBSITE IS HOMO NEW SITE: blacklinux.com/innersanctum/index.php

12-28-2005, 08:49 PM	#3
wootwoot Post Whore! Join Date: Jan 2004 Location: sarasota florida biatch Age: 39 Posts: 3,850 Trader Rating: (0) Feedback Score: 0 reviews	I dont know how you are managing to get such terrible 60 foots!!! Not to be rude or anything but I mean those are TERRIBLE. I had a 2.33 60 foot on Michelin MXV4 plus' which are also allseason and have a 450 trear wear I think. You should be amazed at that car running a 13.6 with those launches! With drag radials and a good driver that would have been a possible high 12 second pass. I would honestly turn the boost down to 12psi to be safe though. Those afr's are not preferable so watch it there bud. Those numbers even see higher than normal to me as well.... __________________ I'm from Florida so I'm probably a bit more strange than you

01-01-2006, 10:25 PM	#6
wootwoot Post Whore! Join Date: Jan 2004 Location: sarasota florida biatch Age: 39 Posts: 3,850 Trader Rating: (0) Feedback Score: 0 reviews	I forgot I had a lsd;whoops! __________________ I'm from Florida so I'm probably a bit more strange than you

12-29-2005, 12:16 AM	#4
-=RS13=- Leaky Injector Join Date: Jan 2004 Location: Canada Age: 38 Posts: 122 Trader Rating: (0) Feedback Score: 0 reviews	Hey It is hard with shot subframe bushings and 1 wheel peel. I know it is brutal and i know i should be 12's but does that sound normal on a stock SR at 2500 feet above sealevel. ANd here is the air/fuel chart. It was on an Ethanol blend with usualy reads aobut 1 point leaner, or so i have been told. There was not a single ping or any detonation. EDIT: all most all of my other 60 foot times were 2.2 -2.35 but my times were 13.6-13.8

01-02-2006, 12:00 AM	#7
smithers584 Zilvia Junkie Join Date: Dec 2004 Location: sc Posts: 416 Trader Rating: (0) Feedback Score: 0 reviews	he is right about the compression, but for some reason most of the sr's i see have about 165-170 across. i dont know why, im at sea level with all your mods and a few more and i cant break 240 hp or torque. my compression ran 165 across. i didnt go cheap either, all my bolt ons are apexi, hks, greddy, or sard and i spent a few hours dyno tuning with my mechanic. sounds like you got a badass motor, get some slicks and some lower 60's and you be set.