Skwerl's first hot rod

[skwerl]

Brian, good luck with the diagnosis, once you have a 12mm compression end, should be pretty easy to remove the springs from #5 if you have access to one of the Freedom Racing Valve Spring tools.

That's what I was thinking. I posted a new thread trying to find whoever was renting out their valve spring tool a while back.

On a more positive note, one of the things I learned on this last dyno run was that my fuel pump duty cycles are at 74%. This tells me that all these huge pumps and injectors are unnecessary for most builds unless you're running E85. I'm using Roush 52lb injectors which are the ones that come stock with a TVS2300, and GT500 fuel pumps with a VMP fuel pump voltage booster. I have plenty of fuel to hit 700rwhp.

 

[Justin00Stang]

Chevy is using a TVS 1740 on the new ZR1.

http://www.carsandparts.com/Article...ium=Email&utm_source=ExactTarget&utm_campaign

I had originally looked at the 1740 when I wanted to do the M90 upgrade, but Roush was able to cleanly fit the 1900 in place of the M90 so it was a no brainer to go bigger.

It's amazing that Chevy is putting a 1.7l blower onto a 6.2L engine and spinning it to 20,000rpm straight from the factory. Much like Bryan's car took off yesterday with the 63mm pulley, the little blowers seem to really love RPM, especially with a good inlet. The 1900 inlet is about 25% larger than the 2300 inlet.

 

[skwerl]

Lethe offered to lend me his valve spring tool. Currently awaiting confirmation on that.

Justin, I'm glad you went with the 1900 instead of the 1740. As soon as we get this little misfire resolved I'll be looking for 700rwhp on your dyno.

 

[Timmbo]

The interesting circumstance that points away from the valve spring as the culprit is that when you swapped coils the misfire went away. Sounds to me like an intermittent injector issue for that cylinder. Try a different injector Brian before you go any further would be my suggestion.

 

[Scott]

The interesting circumstance that points away from the valve spring as the culprit is that when you swapped coils the misfire went away. Sounds to me like an intermittent injector issue for that cylinder. Try a different injector Brian before you go any further would be my suggestion.

Makes sense Tim, Brain pretty simple to do and would eliminate another possibility.

 

[skwerl]

It may have been coincidental because the miss came back as soon as I began driving it again.

The injectors are easy enough to swap, I'll definitely try that as well. It will only take a couple minutes and won't hurt a thing to try.

 

[AutoXRacer]

The interesting circumstance that points away from the valve spring as the culprit is that when you swapped coils the misfire went away. Sounds to me like an intermittent injector issue for that cylinder. Try a different injector Brian before you go any further would be my suggestion.

Totally did not think of that!! Good call.
But something like that should be noticed in logs of fuel pressure, flow, etc.

 

[skwerl]

The interesting circumstance that points away from the valve spring as the culprit is that when you swapped coils the misfire went away. Sounds to me like an intermittent injector issue for that cylinder. Try a different injector Brian before you go any further would be my suggestion.

Tim, I think you may have solved the problem. Do you think this might be the issue?

 

[Scott]

WOW! Easy fix and I am betting you are golden! Way to got Tim!

 

[BadPiggy]

We'll kiss my Lilly white ass.
Tim, you're a damn genius!

 

[stkjock]

Broken O-ring?

 

[Timmbo]

With a torn o ring you'd need to have a pretty large fuel leak to have a miss. I'm thinking possibly the pintle in the injector might be scored or defective and could be hanging up in the injector bore intermittently. I would try a spare injector. If I had one I would send it to you.

 

[skwerl]

I don't have a spare, those were brand new injectors I got from Gerald. They were still sealed in the bag, they came stock with his TVS2300 but he went with bigger injectors. I did spray it out with carb cleaner.

Put everything back together and took it for a test drive. Still surging slightly but it didn't stall on me for several miles until I got it back in the garage. Now it's stalling again. This is getting frustrating. Going to reflect a little before tearing into it again.

 

[AutoXRacer]

Do you think you have more suspect o-rings?

Are the bosses in your heads rough (they shouldn't be).

This is where Justin's logs would come in handy to see if its an electrical, fuel, or possibly mechanical issue.

Basically these are your options:
Air - vacuum/pressure leak; gaskets, o-rings, etc.
Fuel - fuel injector, fuel regulator, fuel leak, etc.
Spark - spark plug, coil, gap, and wiring.
Mechanical - Phaser, solenoid, valve spring, valves, etc.

Man, this has got me wondering. I hate small mysterious gremlins!!!

I say that it all (spark plug, injectors, valve cover, inspect valves, springs, solenoid, compression and LEAK DOWN check, etc) apart and put it back together!! lol
Hopefully its something small!!!

Still surprising no CEL...

 

[one eyed willy]

You can get the o-rings from advance auto parts. Use a dap of oil on them when putting them in.

 

[skwerl]

Yup, I figured they would be readily available. I learned from my hydraulic guy to use vaseline on rubber o rings and seals during assembly. I ended up using an o ring off one of my old injectors.

 

[Weou09]

Glad you got that taken care of. I was about to tell you I have quite a few injector orings if you need some (not that they are very expensive lol) Yea vaseline does the trick every time...

 

[Pentalab]

Chevy is using a TVS 1740 on the new ZR1.

http://www.carsandparts.com/Article...ium=Email&utm_source=ExactTarget&utm_campaign

I had originally looked at the 1740 when I wanted to do the M90 upgrade, but Roush was able to cleanly fit the 1900 in place of the M90 so it was a no brainer to go bigger.

It's amazing that Chevy is putting a 1.7l blower onto a 6.2L engine and spinning it to 20,000rpm straight from the factory. Much like Bryan's car took off yesterday with the 63mm pulley, the little blowers seem to really love RPM, especially with a good inlet.

The 1900 inlet is about 25% larger than the 2300 inlet.

Justin, is the 1900 inlet 25% bigger than the 2300 inlet cuz of the housing you used on the VMP TVS-1900 blower.... and / or VMP D shaped inlet on the intake of the VMP-TVS-1900 blower ?

WX got real bad with loads of rain, so my own VMP TVS-1900 (#2 after skwerl) has been delayed. Then I got into serious home reno's. The new wiring upgrade kit has to be installed 1st.

I would suggest folks vacuum fill both their eng rads and also the De-gas / IC / HE/ ic pump loops. That can save a lot of grief. I'm thinking that perhaps skwerls high IAT's are a result of his new heads and cams...and not from the 1900 @ 15+ psi. The M90 @ 8-9 psi is a blast furnace....pre-ic.

On a similar note, looking at the various graphs + charts for the 1900 blower, it appears the sweet spot for eff / heat( Pre-IC), etc is aprx 9-11 psi. But the VMP TVS-1900 uses a different casing + D shaped inlet, so that may well not be accurate...and ditto with the eaton 1900 graphs and charts etc. On paper, the D shaped inlet + mating D shaped elbow should result in a drop in blower outlet temps..esp at higher boost.

Just read the entire thread from where it left on around P17 a few months back. I'd love to know how much improvement is gained with the JBA LT's. ( I saw plenty with my own JBA LT's).

Later...... Jimbo

 

[Pentalab]

Instead of small plug gaps..like .024" - .028".. why not use higher voltage...like 30-40-50-60 kv...instead of the oem 20 kv ?? Then you could increase the gap by a substantial amount... = better spark.

Jimbo

 

[skwerl]

Welcome back, Jimbo! Good to see you around again, your input is always appreciated.
Yes, I noticed some gains with the JBA headers. I don't have an apples-to-apples comparison but I can tell you that I had 640/588 to the wheels with stock exhaust and 66mm pulley on the 100 octane tune about 2 months ago. That was with stock fuel pump and my fuel pressure got down to 19 lbs. This week (with temps about 20-25 degrees cooler) I put down 643/619 on the 93 octane tune and 63mm pulley. We didn't run the 100 octane tune because I had a bad miss which we need to diagnose before going further. The three differences were 1 pulley size smaller, GT500 fuel pumps and the JBA exhaust. The jump in torque is quite substantial.