Epik

iTrader: (7)

I took my 93 GS along to the dyno today since I had to tune a few customer's cars in. I guess she didn't do too bad considering it does have 211,350 miles

My runs were made in 2nd gear, from 2500 to 6500 rpm. I'll have to get the sheets scanned and hosted on my server and then I'll throw them up here, but the #s went like this.

Baseline runwas 166.06hp/150.82tq, final run was 171.88hp/153.27tq. Let me tell you though, peak #s dont mean diddly unless you are in a HP competition. What makes the difference is the power and torque that was freed up under the peak. Gains were from 5 to as much as 15hp thru the entire powerband.

I was tuning with an SAFC2 and using a combo of the Dynojet wideband tailpipe sniffer and my GReddy A/F guage that is in the downpipe. I did bump ignition timing from the stock 10* BTDC to 12* and gained a good bit of low end as well. It was a good exercise. Now it's time to triple it.

Anybody else with a 1st Gen have any dynos to compare?

Epik

iTrader: (7)

oh.. forgot to mention, the in car thermometer was reading 96* in the dyno shed.. on the dyno software it was picking it up as 101*. Hot as H-E double hockey sticks in there.

007

Stock is 220 HP with 210lb-ft of Torque.

Epik

iTrader: (7)

True, that is what Toyota rates that motor at the flywheel, or crank in this instance. My #s are rwhp (horsepower at the rear wheels). It accounts for parasitic losses thru the drivetrain transferring the power to the ground going thru the transmission, drive shaft and spinning the 18" Volks. I was surprised to see as much hp as it did make considering the mileage on the motor, and the fact that it still has the same spark plugs in it that were in the car when I bought it 5000 miles ago. I'm sure that would be a big improvement in the overall running condition too.

FWIW.. a 2002 IS300 5 speed I dyno'd last year with an SAFC, RMM intake and an axle back exhaust only made 202rwhp.. something to compare to.

Cmon 1st gen guys..speak up!!

Aristo_kat

Well mine is a turbo but had it on the dyno last Friday and made 379hp at the wheels

sillbeer

Jeff, the FC is getting dyno'd next Saturday. I'll post the dyno sheet shortly after if all goes well. Putting a gte in is so temping but I think 1 fast car is enough. I would like to keep the gs for a reliable daily driver so if the gte goes in i'll probably stay with the stock twins. Guys here are getting 450whp on stockers.

-Destin

LB Lex

Excuse my ignorance, but what's an SAFC and what does it do?

sillbeer

It's a piggy back computer. It allows you to change your a/f and timming. I'm not sure what all the options are on it. So you could put in bigger injectors if you wanted to. You can tune for more fuel if you put a turbo on. You can lean out or richen up your fuel maps. It's limited in what you can do with it though.

-Destin

LB Lex

Thanks It seems like it is something that would be needed if you put a turbo on the car.

007

Epik, those are good numbers for a 93'! I wonder what kinda nbrs mine makes. I changed the motor and tranny so i have a 93 with only around 50,000 miles on it. It is running strong like it did when new.

Thanks for posting the dyno nbrs

DaveGS4

iTrader: (2)

Nice results!

Anybody know what the drivetrain loss percentage is on (I assume auto for all) 1st gen GS? Any differences between years?

2nd gen tranny is tuned so soft that it's usually quoted at >20%.

LB Lex

Those are really good numbers. Assuming a 20% drive-train loss, that means your engine, with over 200k miles, only lost around 10 hp. That's Toyota quality

Here's the formula, it might not be right since I forgot most of my algebra:

171/X = 80/100 171/.80= 213. X= 213. Therefore, 171 is 80% of 213, so a 20% loss is 42.6 hp. 42.6 hp + 171= 213. 225(stock hp) - 213(current hp)= 12. Hence, only a loss of 12 hp over 211,000 miles or a loss of 1 hp every 17,000 miles.

I guess highschool algebra was useful! Ha ha ha

Epik

iTrader: (7)

Thanks guys.. a few things..

-SillBeer.. the APEX'i SAFC/SAFC2 doesn't control timing. Only fuel enrichment +/- 50% from the factory setting. The good thing about the new SAFC2 though is that you get 12 adjustment points that can be set in 250rpm increments to pinpoint stubborn holes in the air/fuel curve, and it also has an Knock monitor.
The 2jzge runs pig rich from the factory.. even on the IS300.. so an SAFC2 is a big upgrade when properly tuned.

-93 Lexo.. thanks for the drivetrain loss formula. That rocks!

A few interesting developments. I decided to change my spark plugs last night, b/c it hasnt been done since I bought the car. This is going to make those dyno #s seem even better. The plugs were so old and worn when I took them out, the gap on them was at like .070", and 2 of the plugs were actually missing the electrode.. the part that hangs over the resistor. So, it was on these plugs I posted the dyno #s above.

I decided to go one step further and do a compression check on the motor while I had the throttle body off and could get to the middle spark plug holes anyway. This is where it gets REALLY amazing. 211,500 miles. Running a 16.3@86mph in the 1/4 mile, and posting 171rwhp, 153rwtq.
Cylinder#1- 210psi compression
Cylinder#2- 195psi comp
Cylinder#3- 185psi comp
Cylinder #4- 210psi comp
Cylinder#5- 85 psi comp !
Cylinder #6- 50psi comp !!

Looks like the GTE short block swap is coming sooner than I thought. I finally got my excuse.

The amazing thing is, with good plugs in it, it runs better (of course) and I picked up about 100 rpm of idle speed.. before the new plugs it was struggling to hold onto 700rpm, now she idles great at about 780-790. If the idle is this smooth with 2 nearly dead cylinders, then I cant imagine it on 6.. and the power... smoother and just better. I cant wait.

I am going to the dyno again Saturday to guage the improvement on the plugs.

LB Lex

Wow, that is astounding knowing that you have some blown spark plugs. It seems like the loss of compresion really didn't affect the motor that much. I assume if you put in new plugs you might get back 5 hp, so your car really only lost around 5-8hp even though the compression is bad on two cylinders! This is proof positive that Toyota makes fantastic cars and my future cars will only be a Toyota product

aliga

iTrader: (147)

does not do timing only fuel.