Going slower with good bolt-ons, need help bad!
Thread Starter
Teching In
Joined: May 2002
Posts: 13
Likes: 0
From: beaumont,tx.
Going slower with good bolt-ons, need help bad! I have 1999 Z28 with a A4. Last year April--June at the track I ran a 13.3@ 105, 13.4@104 on many different occasions with a flowmaster muffler, MTI Lid, removed screen from the stock MAF and EGR mod. I ordered a Hypertech Computer in October and installed the Hypertech program with the 160 themostat and it advanced the timing too high and also made my car run too rich so i programmed it back to stock and used the Rev Limiter, Shiftpoints and fan settings. After that, I installed the original thermostat and changed the spark plugs because they were filed out(black). I put some AC Delco Platinum Plugs, 3inch Super Turbo Dynomax and a 80mm Grantelli MAF sensor in there and then saw the tail lights of a 96 stock LT1 which ran 14.2 -- 14.0 @100mph. I blew by him on top end which doesn't matter. Anyway, I then put some NGK TR55's in and it immediately made my car feel peppier and not sluggish like the AC Delco plugs. I thought that the problem was fixed until I went to the track on Friday an ran 13.8, 13.9 and 14.0 all at 100mph. My car has never been this slow! What could this be? Are those TR55 the right plugs, is it the EGR? What could this be? PLEASE PLEASE HELP?
TECH Apprentice
Joined: Jun 2002
Posts: 319
Likes: 0
From: Chicago
Re: Going slower with good bolt-ons, need help bad! Not to sure, but maybe when you removed the MAF screen, u accidentally "tweeked" with the butterfly screen part? All I know is that if you do, u would basically have to buy a new one
Hope this helps, but I really don't know, I have a 00 SS, and would not mess around with the wires, if I were you, I would stay away <img border="0" alt="[Camaro]" title="" src="graemlins/camaro.gif" /> from "free" horsepower" such as removing the MAF screen, just get a new one, like a 85mm MAF.
Hope this helps, but I really don't know, I have a 00 SS, and would not mess around with the wires, if I were you, I would stay away <img border="0" alt="[Camaro]" title="" src="graemlins/camaro.gif" /> from "free" horsepower" such as removing the MAF screen, just get a new one, like a 85mm MAF.
Re: Going slower with good bolt-ons, need help bad! Get to the dyno,and check the air/fuel ratio.BUT...buy a MAF translator first.
dyno tune it to an a/f of 12.8-13.1.then take it from there. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
dyno tune it to an a/f of 12.8-13.1.then take it from there. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
TECH Fanatic
Joined: Nov 2001
Posts: 1,055
Likes: 0
From: Baton Rouge, LA
Re: Going slower with good bolt-ons, need help bad! I'd first try to run the car with the old setup that went 13.3's.
Is the car in good running order though? I bent an axle last summer (god knows how <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> ) and it slowed me down drasticly. The car felt the same on the road though, that was what was wierd. Could it possibly be any goofy matinence item like a fuel filter?
I'm just hoping its something relatively easy and somewhat inexpensive.
Good Luck
Is the car in good running order though? I bent an axle last summer (god knows how <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> ) and it slowed me down drasticly. The car felt the same on the road though, that was what was wierd. Could it possibly be any goofy matinence item like a fuel filter?
I'm just hoping its something relatively easy and somewhat inexpensive.
Good Luck
Re: Going slower with good bolt-ons, need help bad! we need more info like is it having idol problems rich lean? make sure your air passage is clear. ie clean filter no ubstructions. make sure you don't have unmeasured air leaking in(after maf) check it all out. the mods you did are basic and shouldn't cause a problem.
Thread Starter
Teching In
Joined: May 2002
Posts: 13
Likes: 0
From: beaumont,tx.
Re: Going slower with good bolt-ons, need help bad! The car is running smooth except the engine has a small shake but not a miss. I had the fuel filter changed in December of 2001. Would ya'll suggest that I change my Fuel filter? The exhaust pipes are clean.
TECH Veteran
Joined: Feb 2002
Posts: 4,049
Likes: 2
From: Loganville, GA
Re: Going slower with good bolt-ons, need help bad! Reg,
i had the same thing happen to me not too long ago in my 99 WS6. I went to the track one night ran a 13.04@106. went back a week later and ran 13.6-13.7 and i had installed a 3" xpipe and removed the cats. couldnt figure it out. the only thing i had changed in between the 2 races was the MAF (i was running a GMAF > descreened stock). i changed back to the faster setup (gmaf) and went again the next friday. Ran a 12.93 @ 109. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> the 2 things that made a difference for me was 1) shift points 2) weather
what was the weather like when you ran both times and do you manually shift or just punch it?
i had the same thing happen to me not too long ago in my 99 WS6. I went to the track one night ran a 13.04@106. went back a week later and ran 13.6-13.7 and i had installed a 3" xpipe and removed the cats. couldnt figure it out. the only thing i had changed in between the 2 races was the MAF (i was running a GMAF > descreened stock). i changed back to the faster setup (gmaf) and went again the next friday. Ran a 12.93 @ 109. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> the 2 things that made a difference for me was 1) shift points 2) weather
what was the weather like when you ran both times and do you manually shift or just punch it?
Trending Topics
Thread Starter
Teching In
Joined: May 2002
Posts: 13
Likes: 0
From: beaumont,tx.
Re: Going slower with good bolt-ons, need help bad! Thanks Jason, When I ran 13.3's I had a descreened stock MAF. The weather last year was around 80-90 degrees like it i now. When I ran those slow times were in October , maybe in 50-60 degree weather.When I installed the GMAF and programmed shift points, rev limiter and fan settings the car felt stronger, but at the track the times were slower.When I went to Houston Raceway last week I ran 3 times. The first was a 13.8 (2)13.9 (3) 14.0 between 100-101mph. Thats horrible because all the times I have been to the track the slowest times would be a 13.5 @ 103. With those times I'll get beat by a Mustang.It seems like I've lost some of my low end and mid range , but gained on top end. I raced a 2001 lightning rolling around 60mph and the farther we went the farther I left him. I might need to test it one more time at the track before I sed it to a performance shop.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
Administrator
Joined: Jan 2002
Posts: 45,841
Likes: 5
From: Earth
Re: Going slower with good bolt-ons, need help bad! I've descreened my MAF and I've had no problems at all. I actually jumped about 20rwhp just by descreening it. I had it dyno'd for all the non-believers. Maybe it was running too rich beforehand. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />
Re: Going slower with good bolt-ons, need help bad! The few things that I can think of are as follows. If you can, try each one independantly at the track so you can see which one made a difference.
1) Some cars do not respond well to the GMAF (especially at low RPM) - try removing it and putting your stock de-screened one back in.
2) I did some testing last year (but not scientific enough to post results) that lead me to believe that increasing the shift points via HPP3 was actually making my car slower. If you have increased the shift points, try putting them back to stock.
3) Why did you go back to the stock thermostat? Did you change your fans back to the stock settings with HPP3 - if not, they are now running all the time and drawing unnecessary electrical power.
4) What were your approximate 60' times each of the times you ran and how was your traction. If the track prep was real bad some of the decrease may just be traction (although your MPH still should have been higher unless you spun part way down the track).
The TR-55 plugs are right and I had no trouble with the !EGR or running an aftermarket (ported/descreened) MAF.
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Steve
1) Some cars do not respond well to the GMAF (especially at low RPM) - try removing it and putting your stock de-screened one back in.
2) I did some testing last year (but not scientific enough to post results) that lead me to believe that increasing the shift points via HPP3 was actually making my car slower. If you have increased the shift points, try putting them back to stock.
3) Why did you go back to the stock thermostat? Did you change your fans back to the stock settings with HPP3 - if not, they are now running all the time and drawing unnecessary electrical power.
4) What were your approximate 60' times each of the times you ran and how was your traction. If the track prep was real bad some of the decrease may just be traction (although your MPH still should have been higher unless you spun part way down the track).
The TR-55 plugs are right and I had no trouble with the !EGR or running an aftermarket (ported/descreened) MAF.
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Steve
Thread Starter
Teching In
Joined: May 2002
Posts: 13
Likes: 0
From: beaumont,tx.
Re: Going slower with good bolt-ons, need help bad! I put the stock thermosat bck in because my car was running to rich. My exhaust pipes were filled with wetness. I programmed the fans back to the stock setting. I am going to try to stock set up once again.
Teching In
Joined: Jun 2002
Posts: 7
Likes: 0
From: Dallas area Texas
Re: Going slower with good bolt-ons, need help bad! My Hubby has added a manual fan switch and we have ported out our stock MAF ends (descreened also) and bypassed the TB. I have not bought a lid yet however a Drimell tool works wonders to smooth the inside of a stock lid <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Anyway we are cutting consistant 60ft times in the 2.08-2.14 range and running on our daily driver tires with a psi at 21 or 22 psi. We have a best of 13.54 @ 101.78 but I am in a regular TA with an A4 - Not a WS6 mind you.
Our times do get slower as the day progresses - I have yet to hear anyone mention it but since we have an A4, the next thing is a Trans Cooler! Even if you have fans to keep your engine temp down, as your tranny heats up, your ET's will drop like dead weight! Do you have an A4? Could this be a problem for you also??
Anyway we are cutting consistant 60ft times in the 2.08-2.14 range and running on our daily driver tires with a psi at 21 or 22 psi. We have a best of 13.54 @ 101.78 but I am in a regular TA with an A4 - Not a WS6 mind you.
Our times do get slower as the day progresses - I have yet to hear anyone mention it but since we have an A4, the next thing is a Trans Cooler! Even if you have fans to keep your engine temp down, as your tranny heats up, your ET's will drop like dead weight! Do you have an A4? Could this be a problem for you also??
Re: Going slower with good bolt-ons, need help bad! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Lone Star TA '98:
<strong>...Our times do get slower as the day progresses - I have yet to hear anyone mention it but since we have an A4, the next thing is a Trans Cooler! Even if you have fans to keep your engine temp down, as your tranny heats up, your ET's will drop like dead weight!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Is it true that tranny heat slows us down (it does not seem to make sense that it would)? I do notice my times drop some during multiple runs but it seemed like my 60's did as well. I always thought in my case that is was my street tires turning to grease.
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Steve
<strong>...Our times do get slower as the day progresses - I have yet to hear anyone mention it but since we have an A4, the next thing is a Trans Cooler! Even if you have fans to keep your engine temp down, as your tranny heats up, your ET's will drop like dead weight!</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Is it true that tranny heat slows us down (it does not seem to make sense that it would)? I do notice my times drop some during multiple runs but it seemed like my 60's did as well. I always thought in my case that is was my street tires turning to grease.
<img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Steve