hittin the MAF Hz limit while tuning

[SleeperLS]

I am trying to dial in my tune on my car and I seem to be hitting a problem. I have the LS1 MAF on my car and the Hz level in the MAF tables stops at 15000. I have a 3.0 pulley on a gen V and my Hz level is showing over 15000. My wideband is showing my car hittin a pretty damn lean 12.5 at the end of my rpm band. What do I need to do to correct this? Scale down the MAF? I wouldn't think that I would be hitting this limit. Thanks for the help.

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[PANDA]

how much boost (kpa) are you running?

 

[Ron Vogel]

LS1 Maf? If it's the metal case LS1 Maf, you'll need to swap to a LQ4 Maf...LS1 Maf will hit the ceiling real quick on a SC set-up. LS1 MAF=3" ID, LQ4=3.5" ID

 

[10sec]

I see black in his pic so i assume it's an lq4. I'm maxing mine out as well on a 3.0 so i feel the pain, i'm just going to suck it up and get an AFC.

 

[phat_ridegt]

def flowing some air.....

if you really have an ls1, just upgrade to the LQ4...but otherwise yeah you'll need an AFC and scale it down. funny my car never did max out the LQ4

 

[SleeperLS]

Well after cleaning out the MAF and hooking everything back up my car is no longer maxing the MAF out. Not sure what the problem was. After tuning some for the first time ever today, I got my car pretty much dialed in. 11.7 afr at wot, cruising ful trims are within 5 for the most part. Still need just a bit of work on cruising, but other than that car took the 2.8 pulley fine. Motor currently runs 13-15 psi. No kr until there gets heat soak

MAF tables max out at 12500, I was mistaken earlier. Currently I am hitting 10300.

 

[Ron Vogel]

I've seen 3.4 cars hit 10700, so the 10300 looks kind of low. If I was a betting man...I'd look at how restrictive your intake is...seems like you have the valvetrain/exhaust taken care of.

 

[10sec]

Those 3.4 cars probably hit 10700 on a stock maf though, huge difference in comparison. Just sayin... My car def hit 10800 on a 3.4 setup, then barely touched 10000 with the lq4. Now well modded it'll touch the 11400 area with a 3.0 in 2nd gear the 2.8 was maxing it out at 5000rpm in 1st.

 

[02BlueGT]

I hit 9800 with a stock pulley

 

[Handsome Jesus]

buncha junkboxes.

man those piston to valve clearances must be tiiight on your car. 1.8s and an S1x...

 

[SleeperLS]

buncha junkboxes.

man those piston to valve clearances must be tiiight on your car. 1.8s and an S1x...

Yeah, this is actually something I had been wanting to do for a while since I saw I think it was Scotts Bonne from intense with the same set up Plus an IC hittin low 12s. I had the heads machined so that there would be enough clearance for the 1.8. In all reality I still have some room to play but the 1.9rr would have been too much imo.

The combo is kinda unique as well, not a lot of people run this same set-up, they just switch to a bigger cam. Whoch with having a unique sleeper, I thought I would keep that goin. Really, I am not sure what combo would make more power, but after getting my car tuned up the motor is responding well. On my scan last night with the 2.8 pulley, I went from 0-110 in 12.23 seconds....that is a lot quicker than what I used to run before tuning. My car rips up on the top end. Could be due to those 1.8rr

 

[Handsome Jesus]

fwiw I went 12.8 with some of the stuff you have. no rockers though. yours should do better than that.

 

[SleeperLS]

Yup, your right double d...getting my car to hit the times it should be has been a constant struggle...now that I worked the nuts up to tune my own car...should get me there I hope. I just have that good feeling I will hit 12s next track appearance now! That has always been my goal in street trim. My goal with tires and even more tuning would be low 12s...we will see now that I can tune

To whoever cares, e85 ran better for me at like a 11.3 afr...quenched a bit of high rpm kr.


Oh yeah, re-check hz levels...hittin about 10900

 

[02BlueGT]

Yup, your right double d...getting my car to hit the times it should be has been a constant struggle...now that I worked the nuts up to tune my own car...should get me there I hope. I just have that good feeling I will hit 12s next track appearance now! That has always been my goal in street trim. My goal with tires and even more tuning would be low 12s...we will see now that I can tune

To whoever cares, e85 ran better for me at like a 11.3 afr...quenched a bit of high rpm kr.


Oh yeah, re-check hz levels...hittin about 10900

yeah... always with what it should run.

 

[Handsome Jesus]

you'll go 12s no prob man. I like this non IC stuff. I love looking around CGP and seeing slower IC'd cars.

I never posted but my car does about 10800 with the LQ4 on a 3.2

 

[SleeperLS]

Haha, no shit with the "I should be running..." I feel like that is my cars slogan. Last time at the rack I was knockin on 12s door runnin a 10.8 afr and only a 3.0 pulley. With the 2.8 and a bit leaner...car is just running sronger...I mean with my scans before I would do 0-105ish in 13. I triplwe checked last night and 0-110 in 12.2....way quicker

Yeah, I must have the lq4 maf..I dunno why I forgot. Switching the car to e85 was crucial...want to do alky soon to. It wil keep me from having to go with the IC and I will be able to run sub 2.8 pulleys. I enjoy being non-ic. Less expensive, one less thing to worry about and it makes me feel like more of a rebel

 

[SleeperLS]

Haha, no shit with the "I should be running..." I feel like that is my cars slogan. Last time at the rack I was knockin on 12s door runnin a 10.8 afr and only a 3.0 pulley. With the 2.8 and a bit leaner...car is just running sronger...I mean with my scans before I would do 0-105ish in 13. I triplwe checked last night and 0-110 in 12.2....way quicker

Yeah, I must have the lq4 maf..I dunno why I forgot. Switching the car to e85 was crucial...want to do alky soon to. It wil keep me from having to go with the IC and I will be able to run sub 2.8 pulleys. I enjoy being non-ic. Less expensive, one less thing to worry about and it makes me feel like more of a rebel

 

[10sec]

Sub 2.8 pulleys is pushing your luck non-i/c'd, might work on cool days otherwise

 

[Handsome Jesus]

my only advice is don't bother getting super small on pulleys and running crappy timing like 10secsomeday...

 

[10sec]

 

[SleeperLS]

Haha. Even with the alky and currently being ok on a 2.8, you don't think the car could run smaller pulleys? I run 20.5* timing right now...could I even go any higher? Either way, I will keep tuning until I get mid-low 12s with drag tires. Mid 12s with street tires would be sweet

 

[Ron Vogel]

l67's are happy at 20 degrees, you can probably push it farther, but it's a risk that won't gain you much.

 

[SleeperLS]

Thanks Ron, that is what I was thinking. Got a suggestion to drop timing to 18 and drop pullies again. Makes more power this way. My buddy Brian told me about this and he is a really reliable resource. He mentioned to drop afr to 11 and that did yield better results

 

[10sec]

I don't believe this is your story as you've already said you run a richer AFR to help quench the higher rpm kr, thus meaning your pulley is much too small. This gives me the idea that running an even smaller pulley with less timing is just going to make your car slower. Just sayin man... but i have better luck with my 3.0 than the 2.8. The 2.8 clearly had much more low end power but up top i think the 3.0 would take the cake.

 

[PANDA]

My car goes faster on the bigger pulley