BA98MGT

Hi,

I am currently trying to sell my 98 Mustang GT so I can buy a 88 TII, but I have some questions.

It has a K&N cone filter, straight through exhaust with no cats and Bomz mufflers, and when we took a drive in it he hit about 12PSI.. it has like 63K on and and runs strong with good compression. What should this car be running 1/4 mile wise, and how much HP should it put out..

i know these are dumb questions, but i was jus curous bc i have t osell the stang bc it's too expensive and i want something that is close to as fast as it.. my stang ran a best of 14.39, so i hope this TII is faster..

thanks guys!

o, and FYI, i've always wanted an RX-7 since i was able to know what a car is, i LOVE rotary engines (hence why i'm selling my stang for one, lol)

cdaleracer669

iTrader: (1)

stock turbo?

tinvestor

should be pretty close to that with that setup.

BA98MGT

yes, everything is stock other than the exhaust, boost controller, and the filter (o, and some nice guages lol)..

the cars soulds good, but, for somereason he had to flip a switch to turn the fuel on or something.. he said that if he doesn't turn it off, the car will flood itself.. and, my buddy was in the stang behind me (bc the guy drove it while i was in the pass. seat but i really wanted to test drive it, lol) and he said it smelled bad and made alot of black smoke.. i know that rx7's use oil, but should there be smoke coming out like that?

thanks guys for your help

DragonRx7

Are we talking about a little black smoke or a diesel truck running down the strip kind of smoke? The smell is fairly normal since the 7's tend to run a bit rich. The fuel cut switch is normal too for a S4 (86-88), the S5 (89-91) had a built in deflooding system but, you can put it in there for a security measure though.

Oh, and a heads up, Bump is forbidden in the 2nd gen section.

Goofy

Uh. How would a '7 cost less than a Mustang to upkeep?

The fuel switch is due to leaky fuel injectors that cause flooding. You'll at least want those cleaned. A lot of black smoke is bad. Could be an oil seal failure.

Ask him how often he has to put oil in it and what oil he uses.

And how did you check compression?

BA98MGT

sorry about the bump thing.. he said the compression was fine, and the car ran really good.. the insurance on the stang is way more expensive..

i dunnno how much smoke, but my buddy was jus tagging along about 3 carlengths back and he could see black smoke (prolly becuase of those huge mufflers it has, lol)

if i was to buy new fuel injectors, then would i still need the switch?

Goofy

He said is different from the truth.

Check compression. The FAQ has info on how to.

New fuel injectors or properly cleaned/blueprinted fuel injectors should remove the need for the fuel cut switch, though it's still useful in the event you flood the car anyway.

The car can run really well even though it's got a blown oil or coolant seal.

BA98MGT

while i'm at it, how much boost can u safey run on the stock engine?

the car didn't feel faster than my stang, but hopefully it is...

BA98MGT

also, i tried searching on how to check compression, but i couldn't find it.. how do u do it?

NeCr0mStR

iTrader: (3)

definitly get the injectors cleaned, and more than likely if you wanna make any more power you should get bigger ones so you don't lean out.

snowball

12psi is as far as your going to want to go on the stock turbo.

fcdrifter13

WTF black smoke is to much fuel. Blue is oil, white is coolant. Dont post wrong info to discourage new buyers.

BA98MGT

thank you

BA98MGT

i think i'd jus get bigger ones

BA98MGT

i jus talked to my buddy who was following us and he said from what he saw, that it was a little bit of black smoke, and he thinks it was when the car shifted hears..

so is a lil bit of black smoke ok? i've seen it on some cars when they shift.. but i dunno..

fcdrifter13

I dont see how you are running 12psi without a fuel computer, or standalone. Is that on the stock gauge or an aftermarket one.

fcdrifter13

If its not constant and its just a puff your just running a lil rich.

Goofy

I was owned. Oops.

BA98MGT

well, the guages liiked like 2 pod aftermarket ones.. he originally said 10psi, but then when he had it at WOT, he said it peaked 12psi..

i'll have to look again..

ya, it was a puff of smoke

Aaron Cake

iTrader: (1)

If the current owner is running 12 PSI with a stock top mount intercooler and no fuel mods, this engine is not long for this world. Get a compression test done before proceeding further.

BA98MGT

so what amount of boost could i safely run? i want more than stock, but i want this car to last a while.. it only has 63K on it...

idsigloo

10psi maybe. the stock turbo and tmic can do max 15psi, but you can't get there without supporting mods. i.e. larger injectors, fuel computer, ems

Aaron Cake

iTrader: (1)

On the stock fuel system? 10 PSI is the maximum I would recommend. Even that could be trouble in cold weather.

If you plan to mod the car at all, your first thought needs to be the fuel system. People don't like to be addressed with this stuff immediately because it means MONEY. But if you are going to increase boost, you need at the minimum:

-FCD (fuel cut defender)
-larger injectors (generally larger secondaries for minor boost increases...680 or 720cc)
-fuel pump upgrade (FD pump for low boost, Walbro or other high flow for high boost)
-something to control it all like the S-AFC

If you intend on upgrading the turbo and such, then you need a full standalone system. The stock turbo starts to poop out just above 12 PSI anyway.

Secondmessiah

rx-7s arent necesarily faster than a stang in a straight line, but you'll never had to slow down for a corner again, i take my corners between 15 and 35 mph, rx-7s are all about handling