Roe Gurus Please Advise

[KNG SNKE]

Any of the Roe tuners willing to take a scan at 3 datalogs I did today and the tune on my car? Did 3 3rd gear pulls, car felt great. Looking through the charts there are a few items I have questions about and believe need to be shifted slightly. Also for some reason I am still boost creeping extremely high in the higher RPM's. I was boost creeping at the end of last year and I added headers (1 3/4) and 3 inch all the way back to the corsa. Dangerous high. I am wondering if I have something failing or intermittently failing like my BPV.

 

[99 R/T 10]

Mine creeps too, up to 11-12lbs. Not worried about it as long as it doesn't detonate or grenade.........

Screen shot them, save them as a .jpg and post them up. More smarter people out there than me, but you can get a lot of eyes to look and help.

 

[KNG SNKE]

Screen shots wont show details of rpm afr and psi. will just show a graph.

 

[BOTTLEFED]

Well, post it up like mike said and let us know some of the peaks and where you are concerned. Also post screen shots of your VEC tune - fuel rpm/load and ign rpm/load maps. That is just to start.

 

[KNG SNKE]

I'm using the VEC3 recorder. If I post a screen shot you will see a curve but will have no data to know what each section is saying. I can post the tune no problem but it is the stock Roe tune.

Basically you know how you select a section of the datalog to view it? You wont be able to see it through a screen shot.

 

[BOTTLEFED]

Unfortunately that is the only way to share the VEC programs. As I said, you'll just have to tell us the key points. We can tell if there is something drastically off. Just make sure the RPM, MAP/boost, and AFR is on the log graph and the whole pull is on the screen. And as I said, post screen shots of your maps.

 

[plumcrazy]

cant the tune be emailed ?

 

[KNG SNKE]

Yes it can.

 

[KNG SNKE]

Ok a small but disturbing update. Sean emailed me back after glancing at my logs and is concerned. My car is hitting over 10psi on a 5lb pulley past 5500 rpm. This is a huge issue. Beyond that the injector duty cycle and the afr are off. When I get home he wants me to measure my crank and supercharger pulley to verify their sizes then hopefully we can address the other issue. So I will be driving my car like a grandma for a while until I can get this figured out.

 

[SquadX]

Ok a small but disturbing update. Sean emailed me back after glancing at my logs and is concerned. My car is hitting over 10psi on a 5lb pulley past 5500 rpm. This is a huge issue. Beyond that the injector duty cycle and the afr are off. When I get home he wants me to measure my crank and supercharger pulley to verify their sizes then hopefully we can address the other issue. So I will be driving my car like a grandma for a while until I can get this figured out.

Wow yeah def baby it til it's figured out.i assume the easiest fix would be to hope it's a 10bls pulley as u could just swap for a 6.
Best of luck to u in getting this resolved.
Your making over 600 rwhp correct or no dyno yet.

 

[InjectTheVenom]

Weird, I didn't change the size of the stock pulley during construction... oh wait you're tuning the 1:1 thing nevermind

 

[KNG SNKE]

Last dyno read 530 rwhp and 510 tq. This could be why my torque is so low. I should be around 560rwhp and 580tq estimated after a good tune and we thought that is why the numbers weren't matching. The car feels good under boost but I don't want to risk it.

As far as the pulley it is definitely not a 10lb pulley. It came with a 10lb pulley but I swapped that out for a 5lb with bottlefed. I believe I have measured it before but to 2nd check it I will measure again for the sake of troubleshooting.

Those of you that have installed your Roe yourself, did the plate that the supercharger sits on have a metal panel under it to direct the boosted air to the front portion of the manifold?

 

[KNG SNKE]

Weird, I didn't change the size of the stock pulley during construction... oh wait you're tuning the 1:1 thing nevermind

If my pulley is wrong on my car I'm mailing the model back to get the size of that pulley matched appropriately . Just kidding.

 

[BOTTLEFED]

I know we measured them before we swapped. I ran that pulley as 5# for over 6mos. This seems like a weird problem. I hope it gets straightened out. Let me know when you're ready to tune again. And have sean help you clear the security code off your VEC so we can exchange info.

 

[KNG SNKE]

I am very confident in the pulley size, and even the crank pulley size. Do you have that metal panel that directs boost to the front of the manifold installed on your supercharger setup? Wondering if that is a potential issue. This is mind boggling since I have actually opened the cars air flow up through the exhaust and it seemed to make the psi increase 1 psi.

 

[BOTTLEFED]

Yes I have the diverter. The newer models had a different design though.
Have you talked to Sean about the possibility that it may not be boosting that much at all and it is just a false reading by the VEC? If you are having issues with the AFRs and inj. DCs then I would think the VEC is the problem.
Maybe the internal MAP is bad or you have the line connected to a poor vac. source. Do you have a separate boost gauge?

 

[EllowViper]

No air diverter on mine...I believe the 10 PSI pulley is 2.5 inches in diameter.

 

[vipzilla]

Ok a small but disturbing update. Sean emailed me back after glancing at my logs and is concerned. My car is hitting over 10psi on a 5lb pulley past 5500 rpm. This is a huge issue. Beyond that the injector duty cycle and the afr are off. When I get home he wants me to measure my crank and supercharger pulley to verify their sizes then hopefully we can address the other issue. So I will be driving my car like a grandma for a while until I can get this figured out.

didnt i tell you this a while ago

 

[KNG SNKE]

Ok SC pulley is 2.946 so it is the 5 lb pulley
Crank pulley is 6.9 inches.

That rules those 2 out.

As far as the VEC being bad, that is always a possibility but it was checked out prior to installation by Sean and there has been no change in how the vehicle has ran.

As far as having a boost gauge, no I don't have an external one. I do believe the VEC is reading right because at the dyno they hooked their boost gauge into it for the dyno run and both the car and the dyno read up to 9.6psi.

Can someone post a photo of their pulley setup in the front for a 5lb setup? I am wondering if something is different on mine. My kit use to be for a Gen 1 and the guy I bought it from purchased the different parts to make it for a Gen 2.

 

[KNG SNKE]

didnt i tell you this a while ago

I did measure the SC pulley a while ago to verify, never measured the crank one because it looked stock when we pulled it off.

 

[EllowViper]

I believe when I was running my 5 PSI pulley a few years ago, I was getting 8 PSI or so on my VEC logs and boost gauge. Sean told me that was normal since the indicted boost in the manifold did not necessarilly mean the cylinders were getting 8 PSI at the valve. Basically the stock manifold/heads/cam cannot flow as much air as the blower pushes out so you get boost creep (also an indication of a good, tight blower too). The 1.7 RR and headers help however. Not sure what specifically is going on with yours other than from my personal experiences. Shouldn't have sold that W/M kit!!....

 

[KNG SNKE]

I don't want the W/M, it is another point of failure for someone who does not race their car. I like the W/M idea, and might revisit it later, but not for years down the road. I don't plan on going past the 5lb pulley, I am more then happy with that much. Now just gotta find tune this monster and figure the little issues out.


My kit originally came with a 10lb pulley. It had 2 idler pulleys in the kit that were the same size. What size is that idler pulley suppose to be for a 5lb setup. I am wondering if that idler pulley is the wrong size.

 

[EllowViper]

Idler just makes belt sizing easier. I was actually running the stock ider on my 10 PSI pulley without a problem. Sean wondered how I was able to do that and sent me the smaller idler pulley and a shorter belt. I guess the other belt must have stretched enough to fit over the larger idler pulley...Ooops. I did notice with the 2.8 blower a lot more belt dust...so its really pulling ******* that blower pulley. I'll probably go through a belt a lot sooner...but I'll know for sure once I get the motor all back together. Getting the cam spec'd out with CompCams right now and Sean is shipping me some more goodies too...

 

[KNG SNKE]

Wouldn't a smaller idler pulley have the same effect as a smaller crank pulley? I am wondering why he had me measure the crank pulley. The belt can only spin so fast so wouldn't just the SC pulley effect the boost?

I pulled off the vacuum line that feeds the vec and blew air through it to make sure it wasn't clogged anywhere for accurate readings. Sent Sean all the info I had so just waiting for a response. I did install headers on the car and that seemed to only make the psi go higher. I'm hoping its a tuning mixup because he asked me what injectors I had so hopefully it is something stupid like that and we can get on with our day.

 

[plumcrazy]

david weaver used to make a larger (or smaller, i forget) crank pulley to help get more boost.

 

[KenH]

I personally wouldn't lose too much sleep over the boost creep as long as you are not getting detonation. I have seen 10-11psi on my 6.5lb setup at times.

What's the specific concern about the injector duty cycle and A/F? I assume duty cycle is too high and A/F too lean? Are you running the blacktop injectors?

 

[KNG SNKE]

I am running blacktop injectors but I am not sure why he said the AFR was off. Looking at it the AFR was good except in the high rpm where it went lean (past 5600). I can send you the logs though for some reason they are locked, waiting to find out how to unlock them.

I'm not sure what the issue with the duty cycle is. His email said that is some extreme boost, afr and injector duty cycle for 5 lbs

 

[KNG SNKE]

Talked to Sean today. Afr and injector cycle readings are weird because of the overboost. He said exhaust and valvetrain are likely culprits. Exhaust is ruled out due to lack of cats. So hopefully this weekend my buddy and I are going to do compression testing, valvetrain inspection and spark plug wire inspection to verify all wiring is hooked up right. Any other ideas?

 

[SquadX]

Don't rev it pass 5600 rpms lol.
So what is Sean saying about the drivetrain, the rollers are adjusted incorrect, bent rod or to long a rod?
U have 1.7 rr right and are the push rods new?
I don't sh&t about sh$t so I'm just following thread to see fix.

Seams a good guy from my personal experience and will def help u get this sorted out.

 

[RTTTTed]

The crank pulley drives the blower pulley. Larger crank pulley (overdriven) means more spin and a smaller (underdriven) crank pulley means less spin for the accessories and boost pulley. Opposite for the blower pulley. Few guys ran a small pulley on their blower and an overdrive pulley on their crank for a 14psi Roe system.

Ted