[Fraxum]

I don't think there is a 100% verdict and LT1Z350 did log some changes.

IMHO: I think that if the screw is too far in then you are losing some boost.

If not then the screw position does not matter. I tried drag racing with the screw slightly pushing the arm, just touching, and then with a gap. My MPH was consistent in the same DA. 123-126 depending on the DA +1500 to -1250.

It is also possible some A10s are faster than others or track MPH numbers vary by quite a bit. My car will never see 128-9 MPH @ Atco. But it only has 2,000 miles on it so it might loosen up a bit. But judging by what I have run so far 11.4 with a high 1.8 60' If I can get one of those very rare stock 1.6 60s in good air my ZL1 is capable of 11.0s. So even at my MPH there is hope for a 10. More seat time is the plan and good air, good track prep and maybe a tailwind will get me there. LOL

And the low MPH numbers we see on the fast list might be caused by the screw in too far, or they used launch control. My MPH at Atco using LC was 121-122. For good times all nannies off should be the plan with the not pushed in too far blower screw setting.

Opinions may vary.

[bomariam1]

I just saw my SC, and you can see the mark on the lip.

[bomariam1]

Today I done WOT and the needle was between the 3rd and 4th mark.
Tomorrow I will adjust the screws and check again.


Just fast hp tuner question:


What parameter I have to check for boost in scanner?

[bomariam1]

ok I did turn 1/4.
the boost didn't change much, but it sure get better acceleration.

it seems that its controlled by ECU.

[Fraxum]

I want to believe. Read all this again. I think the only sure fire way for someone to tell a difference is data logging as the OP did or back to back dyno runs.

There are too many variables at the track except MPH same track same lane, same DA.

But OP is your sig saying you ran 10.80s@131 all stock in your ZL1?

Also those 120-122 mph ZL1 runs also can be high elevation, extremely high DA, launching with launch control, or letting your foot ever so slightly off the load pedal during the run. Ask me how I know about that last one. Coming off a bunch of M6es there is not much to do after the launch in an auto except stay in your lane and keep your foot planted. Is muscle memory haunting me?

Heading back to Atco again tonight. Any ZL1s out there going? We could fool with our boost screws and compare notes. It will be a good weather night and good track prep.

[Can'tHave2MuchHP]

Originally Posted by Lt1z350

I am data logging my car as I am doing my own tuning and now about 8 others have decided to use me since my tune is about 40 hp then pretty much anyone I have seen on a stock blower. Im about to start a new thread on tuning to see who else is doing there own. I logged 6-9 at best before I adjusted the bypass and after I did on stock pulleys still I saw 12-14 psi. 12 constant with some spikes to 14 at shift points in the logs After I did my 2 inch headers it dropped to 9 again due to the less restriction. Now on a 9.55 pulley im back at 12.5-13 but thought would be more on the rpm its at. I have a very big intake on it 5 inch and does have a full exhaust to the stock muffler. Yet to get to track on mods as raining here all the time in florida right now but my last log my 60-135 mph time is 7 seconds. I couldn't go slower it just killed the tires and even at 60 spins a little. let off at 135 as at end of the on ramp by then and congested around here so trying to keep it safe. my logs that the track when was stock was 3 seconds to 60 on a 1.85 60 foot I didn't have a log of my 1.70s. So using logs the car should run at least 10.0-10.30@ 135-138 in this heat Im guessing that's if on a tire of course.. My car has always run well and yes went 10.80s with stock tune everting stock except had my bumper piece that blocks the grill was out and crush pipe delete I made by just beating the stock pipe back round but was the same piece that came off the car. Was dented just not crushed. On the logs it was making 12 psi and not pulling any timing at all as my manifold temp was under 130 during the run so about as good as you can get on stock tune as it was closing the throttle quiet a bit at that point on the shifts a lot and launch.

As for the 6 speeds it in the tune that when hits a certain torque its closing the throttle or limiting the boost period its clutch protection. Why on a slick it still wont 60 foot worth a shit. They just lay over only way around it is to tune the m6. A tire don't even really help a a10 if the track is good same thing if it hits a certain number on the delivered torque it crashes the boost unless take the bypass vacuum line off completely then just closes the throttle and harder to cover the boost then open throttle back up quickly. I was at sgmp for steeda pony wars and was running 11.40s-11.10s @126-127 when two manuals were there one had a cold air and hoosiers on 18s and ran a best of 12.2@120 and one on a et street with full drag wheels setup and everything else was stock and it ran 12.4@118-119 same 1200 da that day as I went nearly 11 flat @ 128 on my stock tires and was totally stock at that point still. I have one on video and he was even power shifting the car and drove it hard so not like either of them was being easy on it. They were just falling on their face. The one guy even said the car went 11.70s on the stock tire and stickys were killing it. From what I have been told and by the way the tune works if you slip the clutch to death and ride it then the car will 60 foot decent on a stock tune and tire. But you cant just side step the clutch and think its going to be like a fox body 5.0 and hammer out a 1.50 just because your on a tire and a stick. I have learned a lot on these even have other tuners emailing me now. A car that made 750-765 my log is still .5 faster 60-135 and I was on 93 that car was on e70. Some is my combo the rest is my tune. Just helped adjust out a z06 in dubai that was only making 680 on a lot of mods now 730 with a few adjustments to tune. I cant wait for a good weekend to get to the track.

My man, you need an LLC and a website. Start making money. Write off your car and mods as a business expense.

[waterman]

Originally Posted by Lt1z350

I am data logging my car as I am doing my own tuning and now about 8 others have decided to use me since my tune is about 40 hp then pretty much anyone I have seen on a stock blower. Im about to start a new thread on tuning to see who else is doing there own. I logged 6-9 at best before I adjusted the bypass and after I did on stock pulleys still I saw 12-14 psi. 12 constant with some spikes to 14 at shift points in the logs After I did my 2 inch headers it dropped to 9 again due to the less restriction. Now on a 9.55 pulley im back at 12.5-13 but thought would be more on the rpm its at. I have a very big intake on it 5 inch and does have a full exhaust to the stock muffler. Yet to get to track on mods as raining here all the time in florida right now but my last log my 60-135 mph time is 7 seconds. I couldn't go slower it just killed the tires and even at 60 spins a little. let off at 135 as at end of the on ramp by then and congested around here so trying to keep it safe. my logs that the track when was stock was 3 seconds to 60 on a 1.85 60 foot I didn't have a log of my 1.70s. So using logs the car should run at least 10.0-10.30@ 135-138 in this heat Im guessing that's if on a tire of course.. My car has always run well and yes went 10.80s with stock tune everting stock except had my bumper piece that blocks the grill was out and crush pipe delete I made by just beating the stock pipe back round but was the same piece that came off the car. Was dented just not crushed. On the logs it was making 12 psi and not pulling any timing at all as my manifold temp was under 130 during the run so about as good as you can get on stock tune as it was closing the throttle quiet a bit at that point on the shifts a lot and launch.

As for the 6 speeds it in the tune that when hits a certain torque its closing the throttle or limiting the boost period its clutch protection. Why on a slick it still wont 60 foot worth a shit. They just lay over only way around it is to tune the m6. A tire don't even really help a a10 if the track is good same thing if it hits a certain number on the delivered torque it crashes the boost unless take the bypass vacuum line off completely then just closes the throttle and harder to cover the boost then open throttle back up quickly. I was at sgmp for steeda pony wars and was running 11.40s-11.10s @126-127 when two manuals were there one had a cold air and hoosiers on 18s and ran a best of 12.2@120 and one on a et street with full drag wheels setup and everything else was stock and it ran 12.4@118-119 same 1200 da that day as I went nearly 11 flat @ 128 on my stock tires and was totally stock at that point still. I have one on video and he was even power shifting the car and drove it hard so not like either of them was being easy on it. They were just falling on their face. The one guy even said the car went 11.70s on the stock tire and stickys were killing it. From what I have been told and by the way the tune works if you slip the clutch to death and ride it then the car will 60 foot decent on a stock tune and tire. But you cant just side step the clutch and think its going to be like a fox body 5.0 and hammer out a 1.50 just because your on a tire and a stick. I have learned a lot on these even have other tuners emailing me now. A car that made 750-765 my log is still .5 faster 60-135 and I was on 93 that car was on e70. Some is my combo the rest is my tune. Just helped adjust out a z06 in dubai that was only making 680 on a lot of mods now 730 with a few adjustments to tune. I cant wait for a good weekend to get to the track.

Your shared work and insight throughout this thread is greatly appreciated.

Originally Posted by Can'tHave2MuchHP

My man, you need an LLC and a website. Start making money. Write off your car and mods as a business expense.

+1. Bravo!

[joe944]

I found this thread after noticing that my factory boost gauge was never getting past the 7.5 PSI mark.

Made the adjustment and it is definitely going past it now. Obviously not scientific, but the car feels faster, and low speed WOT pulls the car seems to be struggling a bit harder for traction.

My screw was adjusted in pretty far, over a full rotation for sure. I left basically enough room to slip in a piece of paper but that's it.

The PDR videos will show boost when opened with the cosworth toolbox right? I want to look at the data to see if I'm just crazy.

[ZL1 1LE]

Originally Posted by joe944

I found this thread after noticing that my factory boost gauge was never getting past the 7.5 PSI mark.

Made the adjustment and it is definitely going past it now. Obviously not scientific, but the car feels faster, and low speed WOT pulls the car seems to be struggling a bit harder for traction.

My screw was adjusted in pretty far, over a full rotation for sure. I left basically enough room to slip in a piece of paper but that's it.

The PDR videos will show boost when opened with the cosworth toolbox right? I want to look at the data to see if I'm just crazy.

I'd like to see that. Too bad you didn't get a before reading for comparison.

[joe944]

I've got some PDR footage from before I made the adjustment so I can compare.

[ZL1 1LE]

Originally Posted by joe944

I've got some PDR footage from before I made the adjustment so I can compare.

That would be great. I'd be very interested in that comparison. Thanks!

[joe944]

Compared a few PDR's from before and after and it looks the same to me.

Max boost was usually 10.4 with one instance of hitting 10.5.

I think the factory gauges lag behind a bit so they're hard to read when accelerating that fast.

[ZL1 1LE]

Originally Posted by joe944

Compared a few PDR's from before and after and it looks the same to me.

Max boost was usually 10.4 with one instance of hitting 10.5.

I think the factory gauges lag behind a bit so they're hard to read when accelerating that fast.

Thanks Joe!

[IneedAZ]

Finally got around to seeing what mine is at stock. Here is a pic. Is this where most of you were at stock?