Anyone running 9:1 compression or higher, Please post your pump gas timing plus turbo

[BIRDCLAWTSi]

I am trying to figure out if my timing is average, Or below for my compression and turbo on pump gas. I have 9:1 manley pistons, With a decked head, Probably decked more than once. CR may be a bit higher than 9:1. Compression is 205. I am running a 14b with a 7cm turbine housing @ 20 psi. 93 octane, AFR 11-11.5, Timing peaks at 14* That is with a 50/50 water/meth mix.

Before the meth, I could not run more than 15 psi. and 12* timing without getting audible knock that I could hear in the cabin.

I am trying to figure out if this is ballpark timing for my setup or if there is another problem that i have missed. My profile is current and I am talking about the 2.0L. Thanks,
-Dave

 

[Lou98GSX]

for that size turbo and that compression ratio i think your ok

 

[1990AWD]

Yeah looks okay to me. Are you able to measure your IATs after the intercooler? If your IATs are nice and low you could consider running a higher meth:water ratio.

 

[BIRDCLAWTSi]

No way to measure after the IC yet, Im running a 375 ml/min nozzle, turning on at 10 psi. I may try running a higher meth ratio. I have a 625 ml/min nozzle, Which i think is way too big for me right now.

 

[bastarddsm]

Somthings off. Back in 'nam when I had a shit ebay core and a china 16g, and also running a n/t engine with a really decked head, I seem to remember only pulling out a few degrees of timing from the map. At 15psi out should be able to run stock timing and be ok.

I remember being like 11-12 psi with 9:1+ on my 14b and a smic, and not having problems.

You are on a stroker so your numbers should be a little bit lower, but not that much.

 

[KeelesKustome]

98 gsx, A/T 6 bolt, bse, MM oil filter, manley rods, .020 O 9:5:1 mahle forge pistons, magnus HBG, Injen Intake 2g maf, 3000gt 60mm TB, Apexi N1 31/2" Ex, NGK Plug Wires, 2g coilpack, rre rewire, pte 880 FI, 255 FP,AFPR, 20g buschur P&C turbo, OBX v2 ExMani, street gate EW with, kiggly A/T adapter for 2g, FMIC, ssq hks bov, hallman mbc, roadsurge DIY paddle shifter . Trans gauge & cooler, Arp head studs, OEM HG,sodium valves, LC1 WB, fluid dampener UP, 546/547 web cams, bpr7es ngk .017 ,gm map

I'm running 93 pump gas.

Peak at 20* of timing at redline 7,750 rpms

Turbo airflow is aound 42-46 lbs per minute at 26psi droping off to 23psi at redline, with airflow staying the same.


My WOT timing map goes as follows.

1k 30*
1.5k 27*
2k 24*
2.5k 22*
3k 19*
3.5k 18*
4k 16*
4.5k 12*
5k 10*
5.5k 10*
6k 11*
6.5k 13*
7k 15*
7.5k 19*
8k 21*

I found never allowing it to drop below 10 degrees kept my 4 tires breaking loose in shifts.
I also found the biggest issue I once had with knock wasn't my timing, it was carbon buildup inside the combiustion chamber along with the wrong heat range and plug gap. once those problems were fixed I gained all my timing across the board.
On down poor rainy days i have 1.5 degree of knock and thats it.

 

[BIRDCLAWTSi]

Somthings off. Back in 'nam when I had a shit ebay core and a china 16g, and also running a n/t engine with a really decked head, I seem to remember only pulling out a few degrees of timing from the map. At 15psi out should be able to run stock timing and be ok.

I remember being like 11-12 psi with 9:1+ on my 14b and a smic, and not having problems.

You are on a stroker so your numbers should be a little bit lower, but not that much.

This is on a 2.0L, I never had this problem until the 9:1 pistons.

 

[My1GLaser]

I was running 24-26psi on an 18g and flowing around 40lb/min with Wiseco 9:1 CR and 18* timing across the board. I dipped down to about 15* just as it was spooling then ramped it up after peak torque hit at 5k and ran 18-19* across the board. Compression test was 185-190psi.

I did have some knock issues above 18psi when I ran my 14b, but that was 5 years ago and I don't remember much.

Try the non-projected plugs BR7ES

 

[BIRDCLAWTSi]

I was running 24-26psi on an 18g and flowing around 40lb/min with Wiseco 9:1 CR and 18* timing across the board. I dipped down to about 15* just as it was spooling then ramped it up after peak torque hit at 5k and ran 18-19* across the board. Compression test was 185-190psi.

I did have some knock issues above 18psi when I ran my 14b, but that was 5 years ago and I don't remember much.

Try the non-projected plugs BR7ES

I am running the BR7ES's now, My timing is
3k, 14*,
4k, 15*,
4500, 16*,
5k, 16*,
6K-7500, 17*,
At 21 psi.

So far so good. I was getting the worst detonation between 4-5k for some reason. The meth has helped tremendously.

I am curious to see how the stroker responds to timing. It has 8.5:1 pistons. Should be able to get more timing out of it. Trying to finish my other car so I can take apart 2.0L and see if there is something I am missing.

The head I am using has been decked to the point where the oil feed notch in the head was almost gone. I had to notch it out quite a bit. I had it laying around and needed my 2g head for the stroker, So I swapped it out. I would like to know what my actual compression is. When I checked the compression it was between 205 and 207. Pretty high. Stock was like 155 or so. I'm rambling. Thanks,
-Dave

 

[jjw205]

I am running the BR7ES's now, My timing is
3k, 14*,
4k, 15*,
4500, 16*,
5k, 16*,
6K-7500, 17*,
At 21 psi.

So far so good. I was getting the worst detonation between 4-5k for some reason. The meth has helped tremendously.

I am curious to see how the stroker responds to timing. It has 8.5:1 pistons. Should be able to get more timing out of it. Trying to finish my other car so I can take apart 2.0L and see if there is something I am missing.

The head I am using has been decked to the point where the oil feed notch in the head was almost gone. I had to notch it out quite a bit. I had it laying around and needed my 2g head for the stroker, So I swapped it out. I would like to know what my actual compression is. When I checked the compression it was between 205 and 207. Pretty high. Stock was like 155 or so. I'm rambling. Thanks,
-Dave

I'm running the same plugs, and with meth, my timing numbers are similair to yours, just a little lower at peak TQ (Evo III 16G @ 20PSI). My compression was showing up at 200-202 in every cylinder.

Wasn't able to run more than 12*-13* up top at 18 PSI without the meth.....

 

[BIRDCLAWTSi]

I'm running the same plugs, and with meth, my timing numbers are similair to yours, just a little lower at peak TQ (Evo III 16G @ 20PSI). My compression was showing up at 200-202 in every cylinder.

Wasn't able to run more than 12*-13* up top at 18 PSI without the meth.....

That's somewhat comforting. I have an E316g I was considering putting on, I just can't bring myself to do it. Every time I do something to the car I'm driving, That's something that's not getting done to the other car I'm building.

 

[1fastlaser]

9.3:1ish, gt42, ebay front mount, 30psi on 92/93 10 degrees of timing up top so far .