rx7idgit

I was ridding around with some of my friends the other night and one of them wanted to run me in his scion tc. We did a 40 roll and at the top of 4th there was no distance between our cars, I was just in front and it took me awhile to pull on him any. I have an 87 TII with a S4 motor, S5 turbo, 2.5downpipe and catback, stock mid and Bosan intake. What gives? Are these things really just not that fast until you start dumping a good deal of money into them?

rx7idgit

Also, usually WOT in like 2nd at around 40 in the rain=loss of traction. Today, just to check my lack of power theory I gased it in 2nd at about 35 and it wouldn't break loose, so I tried in 1st at about 20, I know spinning tires and flooring it in the rain is pointless but it kinda supports my theory that the car just isn't perfoming.

Node

iTrader: (1)

you have to remember it IS an 80s car. How much is still original?
my car was HORRIBLE until I put on an airfilter and new plugs
you still have stock airbox? get a cheapy cone filter and TID. A dirty airfilter blocks everything else in your car from making power and should be taken care of. It is the only passage for air to combust from the outside.
I only had downpipe and cone filter w/ stock TID and my car was decently quick. nothing amazing though.

What I'm saying is a tune up will help you, maybe some plugs
hows your idle, no intake leaks?

and what psi are you running, like 6 or 7psi?

RotaryEvolution

iTrader: (30)

with those mods if you are still running stock boost levels you could very well have lost power over the way the car rolled off the showroom. try upping the boost and you will see some improvements in performance.

rx7idgit

It has a Bosan intake(open element air filter+little headlite cover with air vent in it,cleaned weekly) the motor was rebuilt like 30,000 miles ago, all I know is the boost is under 8.6(stock FC) and it has the same exhaust mentioned in the above post, just did a tune up, oil, filter, coil, plugs, wires... Dyno sheet that I got with car says 196whp, not sure on what dyno though. What's stock boost, I thought it gradually increased with mods like the exhaust and whatnot.

RotaryEvolution

iTrader: (30)

iirc stock boost on the S5 is 6.5psi where the wastegate spring will open the wastegate, anything above that is boost creep from the freer flowing exhaust and intake. you can install a boost controller to raise the boost levels but only if you have supporting mods like an safc2, FCD and wideband for tuning purposes. the stock fuel system should be able to compensate for boost levels up to 10psi but anything over that is rolling the dice.

Node

iTrader: (1)

maybe you're just a really shitty driver...

rx7idgit

I was waiting for that, I'm not like a pro F1 driver but I know what I'm doing + we went from a roll so alls I really had to worry about was shifting.

RotaryEvolution

iTrader: (30)

maybe he was shooting NOS, you never know...

Jager

iTrader: (10)

Maybe consider that you can't drive or you have low compression.

1SWEET7

iTrader: (1)

Well actually a Scion TC weighs about the same and runs just about the same 1/4 mile time according to these. So it's not hard to believe you beat him by just a little.
87 TII 15.2
Scion TC:15.7

http://www.sportcompactcarweb.com/fe...0411scc_scion/

http://www.albeedigital.com/supercou...0-60times.html

sodara

iTrader: (1)

although the scion tc is 160 hp front wheel drive, i wouldn't under estimate it's light weight design... its not surprising that it would rival the acceleration of stock s4/s5. by the way, how are your tires? maybe if you strip off unecessary weight, it woul feel quicker and handle better...

BlkS5TII

TC and lightweight do not belong in the same sentence. They weigh around 2900lbs without the driver, which happens to be a lot for a car of that design. 160hp and 164lb-ft of torque on an open diff FF, not exactly quick by any standards. Then again, I could just be a little sore seeing as Toyota dropped the 2zz Celica for that slug.

arghx

iTrader: (3)

I just put two car lengths on a stock 2g GSX (check kills forum) on my 172rwhp N/A. That's about as much as a perfectly running stock s4 T2 puts out. And we all know that a stock GSX, while not particularly quick, can easily toast a Scion TC even from a roll where the AWD is a disadvantage. You should be easily taking this thing out.

In terms of magazine times, 15.2 vs 15.7 is not even close! The T2 should be walking away.

What gear were you in when you started out? You should have been in 2nd.

rx7idgit

I was in 2nd and the driver of the scion is a friend of mine so I know it's stock, at the time I had no spare, jack, or passenger seat because it was being fixed because it had seen better days. The driver of the scion ways a good 400+ also, which is enough weight to consider him as having two grown men in his car. And .5 seconds in the 1/4 is a pretty big gap from the cars veiw point.

JinZemog

Something in your car is broken....

RotaryEvolution

iTrader: (30)

you said you were walking him, you do realize that headlights in your rearview give the impression that you are pulling slowly or not at all. in my opinion i think you just misinterpreted the scenario, try rolling next to each other next time.

another thing, the mods you have listed affect performance very little on their own, these engines require boost to see any real gains, read my previous replies.

peachykeenwight

Get an SAFC2, an FCD, and some 720cc secondaries.. do some tuning.. up your boost.. and say "bye bye" to the Scion.

rx7idgit

That's what I'm thinking, I have my car in Houston being checked right now to make sure that everythings o.k.(motor, tranny, anything that needs to be fixed and getting it taken care of along with a compression test to see if that's alright) Then I'm buying and installing a rtek 1.7, 720cc secondaries, aftermarket downpipe(bye bye cat) and whatever else I have the money to do in the future.

91verty

Well if its any consolation my neighbor owns a scion tc. I have driven it several times and i must say that i was impressed! Now remember I am a devoted 7 fanatic, but you have to take into consideration that your car is nearly 20yrs old and even with a few mods and a rebult motor you are still only gaining a few hp on standards of that time.

In short, you have a car that was fast for its time. But look around today and we have trucks and suv's that are running 7-8 sec 0-60 times. Its not the end of the world dude.

Just remember that your 7 is still running good to beat a brand new car! And not to mention that a scion tc is a damn good bargain too for the performance and craftmanship. I mean afterall, it is a toyota......

InMyWhiteTII

I was having the same problem, (lost to a stock taurus NOT an SHO) and then during a compression test i took the spark plugs out by hand. I was losing compression through the spark plugs! i raced him again later that day and walked him.

91verty

well thats the cheapest ''mod'' ive ever heard of man!!

rx7idgit

Just did a compression test and it's in the low 6's, and my spark plugs(that I changed like a week ago) are BLACK. Guess it's time for a rebuild or and s5 motor, opinions?

tjeter

6's are in the 80's psi wise correct? Don't get an S5 motor, just stick with the S4, you won't be able to get Rtek if you go with a S5 motor you know? Also theres other things you have to buy to make the S5 motor work, i believe it has to do with the wiring and the harness i'm not too sure someone else can chime in here for that one.

Rancid7

I happen to own a bone stock 5 spd tc as my daily driver , i don't think a stock tc would even stick with a stock t2 . i dont know why people think they are sports cars . also that 15.7 1/4 mile time was with an intake and trd cat-back if i remember right .

fouled plugs and low compression would definatly explain it .