Lexusalex

I get 15.3 1/4 mi 96mph
and 6.9-7.2 on my SC400 with BFI and Exhaust

anyone have numbers with G-tech?

ki_soarer

if i think about it, ill check mine later. stock 5speed SC300 with a deleted EGR system.

deruvian

It's been a little while since I've owned a manual transmission car, so my runs were not very good. It was a bit warm that particular evening as well. I think I could drop a few tenths, at least, with some better shifting. In fact, it's just about time to go out again...

1995 5MT SC300 (see mods in the sig):
0 - 60 run 1: 7.4 seconds
Quarter mile run 1: 16.2 @ 90mph

0-60 run 2: 7.9 seconds
Quarter mile run 2: 16.3 @ 89mph

These runs were also just after I got it, so no tuneups had been made. Since then, I've replaced all the essentials for keeping the car in check.

BTW - When I changed the plugs, I think they were the originals. Car has 111k miles.

ki_soarer

berfore a tune up and my EGR delete, i ran a 15.9 @ 89mph at the track... so we will see how close the gtech is. ill have to do it tomorrow on the way to work.

Lexusalex

Well so far I have found G-Tech to be preaty acurate. Readings are preaty constant. I tested other cars just to see If its close to numbers that the car should have.

ki_soarer

well, my run was canceled on a count of rain. lol. ill post again when i get a chance to run it.

DroppedGS

What year is your SC400 & 5 speed or Auto? About how much HP do you think the modification do you added?

Ps. Did you do this test with bigger or smaller wheels on the car?

Nice Times By The Way!

Lexusalex

Mine is a 1993 SC400 Auto with Exhaust and a BFI .http://laptop-works.com/lexs400/Resi...20P1010127.jpg
tested it with 17" wheels 235/45/17 on back and 225/45/17 tires on front
I think maybe mods gave around 20hp.
I think mojor improvement over stock is at higher speeds 40 and over.
My friend had a 95 sc400 with 260hp stock . We raced on the freeway before the mods and he slightly had the edge over me but after the MODS way differant story I was easily pulling 2-3 car lenghs on him. He was shocked. However, from 0-60 his car for some reason still has a small speed advantage. I think my problem from 0-60 is heatsoak check my other thread https://www.clublexus.com/forums/sho...d.php?t=185248

DroppedGS

What is "BFI"? Did you upgrade your just Exhaust or the entire Exhaust System from the front to the back?

JBrady

GTech numbers ar typically optimistic. I have the GTech Pro Competition model and right after I got it I went to the track and ran it to compare with the track time. On my 14.22 @ 99.38mph pass the GTech recorded a 13.8 @ 104mph along with a 5.2 second 0-60. Remember the GTech Pro Competition has 3 accelerometers vs. the 1 in the basic GTech. Since that time GTech has released an updated software package that I downloaded and it is now much closer to actual drag strip timing. My typical 0-60 runs with the old software were 5.5 or so and now are 5.9-6.0 seconds.

Regarding the exhaust mods, YES, exhaust CAN definitely but not always increase power. Here is a good link https://www.clublexus.com/forums/sho...hlight=exhaust

Also, the SC did not get the upgraded 260hp engine until 1996, only the LS400 got the upgrade in 1995. The reason your car was slower 0-60 before the exhaust is probably as simple as his car just runs a little stronger. Now that your exhaust gives you the top end advantage that does NOT mean you have gained low RPM power in fact depending on the design you may have lost power.

People tend to think of power as a static number such as "I have 250hp" when in fact peak power only happens at one RPM. Below and above that RPM you have less. At low RPM you have dramatically less. If your exhaust hurts your low RPM power then you will have slower acceleration up until the point that it is improved. Make sense?
Exhaust can definitely improve power

Lexusalex

I Would say that major gain was noticed after the Air intake modification not the exhaust. I did the exhaust first then the Air chamber or BFI as in www.planetsoarer.com

As far as my friends SC400 it must have been a 96 not a 95 because his Air flow Meter was Diferent then mine. I remember comparing it to mine. So i must have the years confused.

Lexusalex

any more g-tech times?