Dyno'd My Roe Setup today. Man do I have questions.

[KNG SNKE]

Ok where to start
My setup
2001 GTS, 5lb Roe, stock heads and headers, catless, corsa cat back.

530rwhp, that is good
510tq, seems low.

Here is where it gets stranger. My car progressively built boost. We saw as high as 9.6 at higher rpms. The guy tapped the dyno machine right near where the VEC get's its input for pressure. I am running a 5 lb pulley, I got it from Bottlefed. I traded him my 10lb pulley so I know it's not a 10lb pulley. The pulley measures 2.95 inches. Can there be this much boost creep? The dyno guys believe my torque suffered so bad because of the higher pressure.

I do have 2 logs of my last 2 runs so if anyone would take a look at them to help me figure this out it would be great. Also at the end of the 3rd run I was smoking fairly bad. Said he felt a slight loss in power like it misfired. I run 1 step colder plugs (came with the kit) and the afr was good. Any info would be outstanding.

 

[mike & juli]

Hey John...have you emailed Sean Roe on this?
~juli

 

[KNG SNKE]

It's on my to do list . Just got home. Already called to talk to him but he left for the day already.

 

[mike & juli]

Awesome...I'm pretty sure he'll be able to give you some good answers and feedback~!
~juli

 

[plumcrazy]

might not be relavant but my car ALWAYS made a TON of torque on nitrous, a lot more than most. no idea why and it does the same with the paxton...no reason for it im told, its just how it is. might be your reason too.

wait around for the guys who know though...

running good ?

 

[KNG SNKE]

On a Roe the torque for a 5lb setup should definitely be much higher then the HP. Will wait for the gurus to chime in on that one.

As far as how it is running, yeah it's running great. Putting it on the dyno is the most abuse it has had so I don't drive it hard but I want to make sure I am not going to pop a piston. Can't seem to figure out where the VEC monitors boost pressure though, I think it is setup to read bars. Gotta find a calculator.

 

[uvbnbit]

I think mine (6.5 lb pulley) was about 30 less on the torque than HP. I'm thinking being w/o cats might have something to do with it???

 

[plumcrazy]

i HATE DYNO's...mine blew up TWICE on 2 different dyno's....lol

 

[KNG SNKE]

I think mine (6.5 lb pulley) was about 30 less on the torque than HP. I'm thinking being w/o cats might have something to do with it???

You are the 2nd person to tell me this. I think you might be right.

 

[Russ M]

The more restriction you have on your motor the more the boost is going to creep. If you do some searching on this forum and the alley you will find that boost creep is very common on roe units.

If you got some headers, roller rockers, a free flowing exhaust(corsa is not it), some head porting, etc, etc... Then you would see less boost creep.

Besides that the graph looks good and the power is right on par with all the other Roe cars I have seen on the dyno. Offcourse there will always be internet racers and dyno graphs showing how they made 1000rwhp on 2 psi of boost.

Enjoy it.

 

[KNG SNKE]

Trust me I understand there will be boost creep but to see 9.6 psi is a little higher then I was told to expect. Was told I would see 7 to 8 psi.
That's why I am nervous. HP is dead on where I should be. I can tune it to past 550 easily.

 

[Red Snake]

My car has very little creep with stock heads, T&D rockers, Belanger headers, Corsa track exhaust and no cats. I saw 1 pound of creep at the 5500 rpms with the 8 pound pulley and 1 pound of creep at 5500 rpms with the 10 pound pulley.

I also made 635rwhp/671rwtrq on the 8 pound pulley (no w/m). I think your torque would be less with cats but not that much less. Sounds like something is definitely wrong to me.

 

[utahviper]

Your cats are probably shot! You should be making alot more TQ than you are. I wonder what your timing curve looks like. I dont know how much power you should be making with that dyno. Do those read low like mustang or what? Check your cats for sure.

 

[KNG SNKE]

Shot no, non existent, yes. I do not have cats.

These dynos are known for reading low but not that low on torque.

 

[99 R/T 10]

Have you done any custom tuning from th estandard Roe cards?

 

[EllowViper]

He has no cats. I would think running a 10.0 AFR would kill the torque since max torque is achieved at 13.2 AFR. But we all know you can't run that AFR with these set-ups. I think Sean will lean it out a bit or add in some timing. I think an additional 40-50 ft lbs are easily attained.

 

[KNG SNKE]

Stock Roe 5lb tune. Only adjustment I made was under heavy vacuum I set the injectors up to cut off.

 

[RobZilla]

I was with Sean today. Took the TT SRT to another shop for delivery. He says standard for a 5lb set up on a Gen II stock motor is about 115-130 hp gain. You are about right on with that.

Mine has pretty much the same mods as yours just headers. 544 hp.

 

[KNG SNKE]

I completely agree Robzilla, the HP is not the issue. It's the 9.6 psi of boost being read. The TQ is kinda low too but if that's just due to tuning no issue. The TQ should be higher then the HP on this setup, no?

 

[RobZilla]

What dyno are you using?

I have heard it DOES make a difference. 9.6 is obviously way off. Tq does seem low as well. I agree that a call to Sean should help. Be patient, he is super busy these days.

 

[1TONY1]

Ok where to start
My setup
2001 GTS, 5lb Roe, stock heads and headers, catless, corsa cat back.

530rwhp, that is good
510tq, seems low.

Did they have the dyno set on the "Dyno Jet" mode or just normal. Somewhere on here I have my car n/a on back to back pulls Dyno Dynamics vs DynoJet and also a DD in DJ mode.
I'm not sure what tq a stocker with 5lbs would pull but the DD could certainly do different things than a DJ due to the way it works.

I would watch my boost gauge and wouldn't care what anything else says. Actually I wouldn't watch mine but you get the point
Smoking ? Loss of power ? Hows it running on the street after the dyno pulls ?

 

[KNG SNKE]

No loss of power, runs great on the street even right after dyno. Slight smoking at really high rpms. No boost gauge in the vehicle. I datalogged with the vec so I should be able to see boost there right?

I plan on hooking up a mechanical boost gauge just to verify these readings soon, not a permanent one just temporary and do a run to see what I come up with. Kinda hard to believe a 5lb pulley would make that much boost.

 

[KNG SNKE]

[media]http://www.youtube.com/watch?v=0ib_wLBUrO4[/media]

First attempt at video editing.

 

[KenH]

My torque is a little lower than my HP as well. I'm at about 575HP/565TQ.

I also have a lot of boost creep. I have logged over 10psi at times on my 6.5lb setup. Doesn't always happen consistenty though, so I am not sure what the variable is. Perhaps somewhat dependent on temperature, A/F or some other variable that changes between runs. I have noticed at times that there appears to be a possible correlation between the amount of timing advance/retard and the amount of boost creep.

 

[EllowViper]

Oh John...I see this starting already...Ha. Tinker tinker tinker now that you have the tuning "bug" !!! Same happened to me several years ago...once you start taking a look at what the motor is doing, what its putting out, trying to optimize this and that...next thing you know its adding the W/M (cause its sitting in your garage and "I have boost creep anyways")...then once you get used to the 5 lb pulley and it doesn't seem quite as scary anymore...the 6.5 comes next...and so on. Now I'm on the fuel system re-engineering train and thinking about NOS too! This will be YOU in three years!!! You have drank the ROE cool-aide and there is noooo going back now my friend!!!

 

[VIPER BAZ UK]

Sounds great.................
Will dig out my sheet as well... Mine is not finished though..fine tuning needed..

 

[KNG SNKE]

Oh John...I see this starting already...Ha. Tinker tinker tinker now that you have the tuning "bug" !!! Same happened to me several years ago...once you start taking a look at what the motor is doing, what its putting out, trying to optimize this and that...next thing you know its adding the W/M (cause its sitting in your garage and "I have boost creep anyways")...then once you get used to the 5 lb pulley and it doesn't seem quite as scary anymore...the 6.5 comes next...and so on. Now I'm on the fuel system re-engineering train and thinking about NOS too! This will be YOU in three years!!! You have drank the ROE cool-aide and there is noooo going back now my friend!!!

For my wallets sake I hope your wrong .

I only have my few concerns, the biggest being that 9.6lbs. I need someone to tell me how to read boost on my Roe datalog to verify the dyno's readings. Can't seem to find that section of logging.


I also forgot the dyno guy did not have the rpm monitor hooked up since I was data logging so probably going to have to look at the logs to figure it out. My boost numbers on the vec don't match except in the higher end of the revs, I do read up to 9.6 right at around 6k.

Baz, mine is not finished either. No fine tuning done, still running off Roe's tune.
The tq number is not a concern of mine, just want to make sure it is right and nothing is wrong with my car.

 

[mbccenter]

Get a boost gauge and keep it in the car. Always nice to know where you are at. I can't see having that much boost creap. Mine would hit 10lbs and never move.

 

[KNG SNKE]

Verified the numbers from the dyno with the VEC recording thanks to Steve00RT/10. Definitely did hit 9.6psi right near redline. It definitely did have that much boost creeep, but the question is why.

I emailed sean about it so I am waiting his response.

 

[Red Shift]

Holy hell lean that out!!!

I dyno'd 523/519 on a DynoJet with STD correction. It was a decent dial in. I kicked on the water/**** and pushed 555/578. Both on the 5psi pulley.

Shoot for 11.8 AFR without water/****. There will be a considerable difference from low 10s. The 10s can be trouble territory for washing down the cylinders with gasoline. Ignition timing is also huge. What timing curve are you running? Remember that ignition timing can affect resultant AFRs. If advancing the timing, do that before leaning it out to your goal mixture.

The dyno and the road are different things. You may log a different AFR once you hit the road. Keep some fat in the dyno tuning before polishing it off on the road. I remember one member mentioning that the AFR will be leaner on the road than the dyno. Why is this?