What is causing this GTO to run slower?
02-08-2014, 12:27 AM
#1
A friend of mine just bought an A4 GTO and its 0-62 (or 0-100...speedo is in kilometres here) is 8.4 secs! Whereas mine when it was stock used to do it in 5.2 secs.
So 2 cars...both same make, year and model. Both stock and yet one is a full 3.2 secs slower to 62.5 mph. WHY??
What are the things that would make a car run slower, to this extent??
Did a compression test, everything was fine. Spark plugs are in good condition and leads checked out using a multi meter and a continuity test.
If you didn't know how fast ls1s are supposed to be, you would think there was nothing wrong with the car. You would even think it was fast. But when a normal GTO is actually almost twice as fast...you know there's gotta be something wrong with it.
I feel bad for the guy cz he actually bought the car cz he liked how mine performed.
So what is the checklist. What should i go through?
So 2 cars...both same make, year and model. Both stock and yet one is a full 3.2 secs slower to 62.5 mph. WHY??
What are the things that would make a car run slower, to this extent??
Did a compression test, everything was fine. Spark plugs are in good condition and leads checked out using a multi meter and a continuity test.
If you didn't know how fast ls1s are supposed to be, you would think there was nothing wrong with the car. You would even think it was fast. But when a normal GTO is actually almost twice as fast...you know there's gotta be something wrong with it.
I feel bad for the guy cz he actually bought the car cz he liked how mine performed.
So what is the checklist. What should i go through?
Last edited by Freefallin; 02-08-2014 at 12:39 AM.
02-08-2014, 06:05 AM
#3
Given the engine seems to be healthy, I assume it's a bad tune combined with a bad driver. If he spun or wheel hopped for a while that would explain his time.
I would take it to a dyno shop and have em put it on the rollers. There you will see exactly how much power it's making and a competent shop will be able to guide him in the right direction to repairing it if the number comes up low.
I would take it to a dyno shop and have em put it on the rollers. There you will see exactly how much power it's making and a competent shop will be able to guide him in the right direction to repairing it if the number comes up low.
02-08-2014, 11:57 AM
#6
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Did he just roast the tires? If he's getting any type of tire spin then the times will be slower. Which can lead to me thinking your tires just could've been alot better than what he has.
I'm assuming you're using GPS to do the timing, are you sure it's 100% accurate?
If you've riden in the car, does it actually feel slower?
I'm assuming you're using GPS to do the timing, are you sure it's 100% accurate?
If you've riden in the car, does it actually feel slower?
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02-09-2014, 01:44 PM
#11
Appreciate the replies guys!
@ JC316... Already changed the fuel filter so it can't be that.
@ Redtan... Can't be a tune cz there was no tuning done. As for the tires spinning, the tires never loose traction when you go WOT. So from a dead stop...1 2 3 go!...pedal to the metal (traction control off)...the car accelerates but tires will never loose traction unless they are on super smooth asphalt that is wet. Which is actually an indication that it is not performing like it should. Logically you would be able to deduce a poor 0-60 time from it not being able to burn rubber at take off.
@ Danieloneil01... No, no CEL. And we both have the same car. Both LS1.
@ RockinWs6... Judging by the rpm yes.
@ DREAMZ28... Tires are OK and similar to mine. Haonkook vs. Bridestone. Booth all season. Didn't use GPS, just the dash digital speedo and a stop watch. And yes it does actually feel slower. Also we raced a few other GTOs and my friends car lost miserably everytime (except one time...the other GTO musta been really F'ed).
@ RAGaines3... Trans fluid is fine as is the trans itself. Its doing its job nicely.
@ Garygnu...About 175k. Yes i know a lot. Will try the MAF cleaning but how to know if cat is clogged?
@ Poltergeist 02... Yes calculation is accurate. 1 mile = 1.6 kilometers.
@ JC316... Already changed the fuel filter so it can't be that.
@ Redtan... Can't be a tune cz there was no tuning done. As for the tires spinning, the tires never loose traction when you go WOT. So from a dead stop...1 2 3 go!...pedal to the metal (traction control off)...the car accelerates but tires will never loose traction unless they are on super smooth asphalt that is wet. Which is actually an indication that it is not performing like it should. Logically you would be able to deduce a poor 0-60 time from it not being able to burn rubber at take off.
@ Danieloneil01... No, no CEL. And we both have the same car. Both LS1.
@ RockinWs6... Judging by the rpm yes.
@ DREAMZ28... Tires are OK and similar to mine. Haonkook vs. Bridestone. Booth all season. Didn't use GPS, just the dash digital speedo and a stop watch. And yes it does actually feel slower. Also we raced a few other GTOs and my friends car lost miserably everytime (except one time...the other GTO musta been really F'ed).
@ RAGaines3... Trans fluid is fine as is the trans itself. Its doing its job nicely.
@ Garygnu...About 175k. Yes i know a lot. Will try the MAF cleaning but how to know if cat is clogged?
@ Poltergeist 02... Yes calculation is accurate. 1 mile = 1.6 kilometers.
Last edited by Freefallin; 02-09-2014 at 03:35 PM.
02-09-2014, 04:17 PM
#12
Something is very wrong with that engine if you can floor the car from a dead stop and not every barely spin all season tires.
Even when my car was stock, if I took traction control off and just floored it from a dead stop I would destroy even summer tires and just sit there spinning all day.
Even when my car was stock, if I took traction control off and just floored it from a dead stop I would destroy even summer tires and just sit there spinning all day.
02-09-2014, 05:11 PM
#15
with that many miles you should check out the complete valve train .mite need lifters and rocker arm bearings .saw a thread recently on testing cat flow ,maybe remove them.try a leak down test and tell us the results .what yr is the car ? trans fluid can look good ,but if it wasn't changed when needed it will only hurt the tranny .the clutch packs wear out of materiel after a while .
02-09-2014, 06:35 PM
#16
Something is very wrong with that engine if you can floor the car from a dead stop and not every barely spin all season tires.
Even when my car was stock, if I took traction control off and just floored it from a dead stop I would destroy even summer tires and just sit there spinning all day.
Even when my car was stock, if I took traction control off and just floored it from a dead stop I would destroy even summer tires and just sit there spinning all day.
Both 3.07:1
with that many miles you should check out the complete valve train .mite need lifters and rocker arm bearings .saw a thread recently on testing cat flow ,maybe remove them.try a leak down test and tell us the results .what yr is the car ? trans fluid can look good ,but if it wasn't changed when needed it will only hurt the tranny .the clutch packs wear out of materiel after a while .
02-09-2014, 07:44 PM
#18
