2 S13s, 91 & 93 - 93 isnt as fast????

[RatedR]

I just bought my girl a 1991 240 LE with 147,000 miles on it. While driving it home after I bought it, I noticed that it had more power than my 1993 SE. I could flat out floor the 91 and it'll jump right on it in any gear from 2500 RPM, but my 93 would bog and slowly accellerate....this seemed weird to me because my 93 only has 120,000 miles and I do regular maintenance to it. It didnt seem like the guy I bought it off of had great maintenance ethics with his car, so I am really worried about my 93. The only mods I have for my car (the 93) is the SPEC stage 1 clutch that I installed correctly. Can someone explain how my car is slower than my girl's car????

[hyb force soldier]

The weight of the cars may make a difference. The 93 I think is slightly heavier than the 91, but should not be that much of a difference. Maybe something wrong with the fuel system, the injectors? Grip of the tires? It could be anything that has to do with putting the power of the engine to the ground. Hope this helps. Later.

[240marcuSX]

maybe she has an lsd and you dont?

[toki]

Yeah. It's the tires. Because we all know a stock 240 will chirp those tires already in gear!

Run a compression test and check for exhaust leaks (usually audible), if not run a leakdown test, change your plugs, throw some STP Fuel system cleaner in. Something is bound to help. Everything on that list can be done for $20 and some friends who can get the compression and leakdown meter. There is also this seafoam stuff people rant and rave about how well it works, takes some time to do though if i remember correctly.

Did you work on your flywheel at all when you changed your clutch? That *might* also be a problem.

[RatedR]

TOKI - Well, we inspected the flywheel and it seemed alright. I cleaned it off and the damn thing runs smooth. The clutch really helps to put the power to the ground, but I'm still lagging from 2500 on up. I really feel like its the engine. I'm not sure if I should bother checking up on it cause I'm more than likely to swap in the SR earlier next year.

MARCUS - I know she doesn't have LSD, none of the LE 240s came with them, only the SEs. I do have a j30 at home that I'll be installing into mine. >:)

HYB SOLDIER - She DOES have better tires than me. But I dont really sit there and spin them, just seems like when I'm rolling I dont get that "kick" that her car gives when you floor it. My car seems like it's LAZY and then finally wants to run.

Thanks for the input guys, by the way, I opened up my intake box just to kicks. I think I'll replace it, could be all that hot air that's getting in there that causes my lag. I know for sure that if there were 2 of me(eliminating the driver factor of the race) and we raced with both cars, the 93 will definitely loose.

PS - I previously posted a thread that stated my loss to a 90 fastback with my 93. I really have to find out what the hell is wrong with that engine.....

Janeh' (LATER)-R

[Structure240sx]

replace ur fuel filter too. if that is cloged its goin to make it a lot harder to rev it. get a 300zx filter

[leper421]

MARCUS - I know she doesn't have LSD, none of the LE 240s came with them, only the SEs. I do have a j30 at home that I'll be installing into mine. >:)

I have a stock VLSD (R200V) in my 91 LE. I dont know what came standard with the LE, but mine has every option except HICAS and the digital dash.

[RatedR]

structure - I do have a 300zx fuel filter, didnt really feel that much of a difference...

[Meantime]

'91 does have a slightly "hotter" exhaust cam than other years with the DE. However, it's not really that big of a difference IMO.

[RobDET]

butterflys stuck closed?

[[Zero-S]]

Get rid of 'em all together:D

[RatedR]

Zero - HELL NO~! LOL~! :P

[RobDET]

I think he ment the butterflys Rated... not the cars

[RatedR]

Oohh, I dunno, I'm not sure if it IS the butterfly or if its just the AIV Valve. I'll look into the AIV first, then consider the butterflies. Thanks though~!!!!

PS - Call me R

-R

[p00t]

i think rob might be on to something since the butterflys are supposed to completely open around 2500 right?

[NISTECH]

get the info from the service manuals for gear ratios in the trans and rear end between the 2 cars.

[james_kong]

all these ppl's responses dont really answer the part about ur car bogging...maybe dirty injectors? or piss poor gas? bad timing?

[nlzmo400r]

if your car is bogging, it may be running with crappy injectors or possibly your fuel pump is going bad, check your fuel lines and think about replacing your in-tank, hope that helps some

[RatedR]

it doesnt really bog, just doesnt kick up like the 91 does....the 91 does have a rebuilt transmission, just got done pulling it out today. My 93 just doesnt take off as fast as my girl's 91, I'll check the AIV valve. I'm not really sure if its worth the trouble to take out the butterflies, does it really make that much of a difference?

PS - this would sound like a newbie question, and I know the answer is probably NO, but I'm still going to ask:

Would removing the butterflies affect emissions/smog? (Idle)

Thanks~! Janeh'~!

-R

[RobDET]

i don't know. You should defiantely make sure they aren't stuck closed tho.

[Touchdown038]

Have you given your car a tune-up lately? Plugs, wires, cap, rotor, all that jazz?

If so, a compression test will tell you a lot, as will a fuel pressure reading and a timing light.

[RatedR]

Well, I've given it a tune up, but I skipped out on the plugs, wires and distributor stuff...they all seemed new. The 91 seems like it needs newer wires than the 93. Sorry if its been a while guys, got caught up with the 91's clutch.

Here's an update though:91- passed smog after timing adjustment93- now has J30 VLSD into it (YEAH BABY)

The cars are still noticably different, the 91 definitely is faster to kick up. I really want to make the 93 as fast, but dont have a clue as to where to begin the work..... I'm willing to consider the butterfly removal if I can get confirmation that it doesnt affect emissions. I'm only concerned that the car will idle too ROUGHLY when they smog it. Can anyone find out if it IS an emissions NO NO????

Thanks People~!

-R

[NISTECH]

where are you in calif?

[RatedR]

I live in the East Bay, around Pittsburg.

[NISTECH]

sac here. just curious how close you were.

[RatedR]

So did you know if the butterflies' absence would affect me in smog????

[NISTECH]

you know i am not sure ,not visually i dont think.. I would never notice it so as long as the pipe tested ok i would probably pass it.

[NISTECH]

only thing i think it would affect would be maybe HC's due to being a slight bit leaner but not much since it is only drawing air through the same port, throttle body.

[bvanev]

This is just a thought, but if your MAFS is faulty, the ECU will go into"fail safe mode" and you will have a lot of trouble above 2500rpm. I have seen this on the KA24DE and the SR20. Check it out.

[240driver39]

i think instead of just tossin stuff around, u could go through some facts.

first off s13 cams are all the same, 91-93....91 doesnt really have hotter cams, s13 cames are more aggressive however compared to s14 cams

93's arent "heavier" its the same car...

Basically both cars have higher miles, both cars have had different treatment throughout their lives, so if u expect both cars to be equal in terms of power...eh...

the one is prob down in power, if its got higher miles, u should be doin a tuneup nehow. U say it bogs down low, i doubt its stuck butterflies, but takin them out wont help u down low nehow, that will hurt u lowend power...u can clean out ur tb if ur worried bout stuff stickin and such. u said u got the fuel filter, thats good, new air filter would be good/cheap, cap/rotor/wires arent expensive really and are a good investment nehow. Check ur timing, do the easy stuff first.

and are u sure it actually feels faster? or does it just have a different feel then urs. Cause ive drivin my buddies 93 coupe and it "felt" faster, but its clear that mine pulls on his just cruisin...sometimes they can "feel" one way

just my opinions...