LT1 Pacesetters

[hufan1112]

I just purchased pacesetter quick trip LT's. I was wondering if the car will run fine computer wise after install? If not, what would be the cheapest way to solve the problem?

Thanks

[cocobolo95]

After market headers flow better than stock and require changes to the pcm tuning to get peak performance out of the car.

Since you don't mention what year your car is, and the year makes a big difference in tuning software available, I'll do a run down. Of course you can always have a tuner do the work for you, but I'm assuming you wish to go the do it yourself route.

If you own a 94 or 95 obd1 car, You can get a cable that hooks your car's dlc to usb of laptop, tunercat obd tuner, and DataMaster to log the sensor data, for $280 or less.

If you have a 96 or 97 obd2 car the tuning software gets much more expensive. Just for jet dynamic spectrum tuner, be prepared to pay about $500, other obd2 tuners run that much and more. You will still need the cable to hook dlc to usb of laptop. That will be $60-90 depending on where you get it. And you will need a obd2 scan and data log program similar to DataMaster, which I have no recommendation for.

For a 93 obd1 car, which has a removable chip, rather than a reflashable one like 94-97, you will get the same programs that 94 & 95 used, plus the addition of a chip burner, its program and chips to burn.

For sending your pcm, or ecm on 93, out to a tuner, members here use www.lt1pcmtuning.com www.pcmforless.com
www.madtuner.com

And if you go the tune it yourself route, you must obtain the knowledge of what pcm settings to change, and how much to change them. I suggest reading as much on the subject as you can. The lt1 tuning site has some good info, as well as, other places on the net.

[steveo]

yeah but his question is will it run fine; the answer is yes

can get it tuned later down the road

[Locruid]

I changed to a hotcam, 1.6rr, Longtube headers. Also removed my EGR and Air Pump.

Car runs fine. A bit on the rich side but thats expected. Also has very slight surging but pretty sure it's cause I'm not running an LT4 module with Rollers.

Hopefully getting it tuned in a couple weeks anyways

[PurplePoncho]

Unless your a 96-97 you will not run into any issues. If you are then you will need to have your pcm reprogrammed to delete the rear o2 sensors as they are no longer used when headers are installed and will throw codes and can cause the engine to run rough

[steveo]

Originally Posted by PurplePoncho

....and can cause the engine to run rough

sorry, that's just not true

the rear o2s on these cars aren't used for anything except obd-ii compliance and would never affect how it runs

if you can live with the check engine light, it's not even necessary to tune them out

[97z28convt]

And the cheap fix for that is o2 sims:....

[MrCompton]

Since I'm sure more than a few people will read the O.P. post, how has your car responded to the Pacesetter LTs? Haven't really found a whole lot about LTs vs stock.

[95 Firehawk]

Unless you're running in speed density mode, you should be fine. The MAF will account for the additional flow without any problems. It's always a good idea to have the VE tables tuned for it as well, but it's not as critical when using a MAF.


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[E&A's T/A]

Originally Posted by MrCompton

Since I'm sure more than a few people will read the O.P. post, how has your car responded to the Pacesetter LTs? Haven't really found a whole lot about LTs vs stock.

My stock lt1 with pacesetter long tubes, air, egr removed and lt4 km but never tuned actually seemed to loose quite a bit of it low end torque it doesnt seem to have the take off it had before but i notice a great improvement in the high rpms. Tunercat is next on the list to get the low end back hopefully

[steveo]

yeah, you need to tune it but there's another factor; the restrictiveness of the stock manifolds does aid scavenging at low rpms

bigger primaries, and actually tubing throughout the system, tends to kill your low end torque a bit

...but you get way more where it counts.

it's the same as if you ran 1.75" exhaust right to the back of the car. you'd get more low end torque than a 3" magnaflow catback would give you. but it'd start to strangle your engine when you actually get on it, so that would be dumb.

[E&A's T/A]

Yeah there's always give and take with just about anything. I do have 3" exhaust all the way back. I have heard the the best scenario for scavenging would be if all the primaries were the exact same length which is impossible on these car with the limited space in there the best you can do is just buy a good set of headers from a manufacturer with a good name

[steveo]

there are tuned length headers for the LT1 that fit

[DUDBIRD113]

After i installed mine i had no problems, so tune shouldnt be neccesary

[anthonyp]

Tune isnt absolutely necessary for running with the LT's after the install, but you wont be getting peak performance until you do. I wouldnt waste time or money on a tune until you get a few more mods done, dont get a tune JUST because you installed LT's, unless that the only mod youll be doing.