Tuning?
 

Ok just went for a ride and noticed something on my logs. Even at 30psi my lbs/min still are at 53lbs/min. So what's up? that's the same lbs/min I was seeing at 22psi.

But when I first started out on 23psi I noticed my lbs/min were 55lbs/min?

Re: Tuning?
 

Maybe you maxed the MAS?

Re: Tuning?
 

I would also bet you were pinning the MAS. How many Hertz of airflow are you seeing? I think the 2g one can read up to 2800hz ? I'll have to go look it up.

Re: Tuning?
 

GM MAFT it. ;)

Re: Tuning?
 

Yup, time for a MAF, unless you wanna do MAP w/ EMS.

Re: Tuning?
 

That's sucks. For now till I move back I'll probably just keep pushing it on Pump Gas. And then go to MAF or EMS later.

Hopefully I'll be able to get a little bit better of a tune going should still be able to make more power even if I won't be able to up the boost to where I wanted it.

Re: Tuning?
 

You could start hacking the 2G MAF and using the MAF compensation table in DSMLink or just clamp the MAF and start using the VE table in DSMLink.

Re: Tuning?
 

You need a PMS.

Re: Tuning?
 

Well Not sure exactly if this was the problem but today I took the car to work, and everywhere that entailed. and no matter what I did the stuttering never stopped.

Well right as I was on my way home about 1/2 block from my driveway I got on it to pass a car and My downpipe coupler fell off. Not sure if that was the problem the entire time but I did lower my boost back down to 25psi which I'd been running on pump gas for ever. And still had the same problems. Plus I was noticing that my boost was coming on later.

I found the coupler (went home and jumped in the concorde with Jenny) and it only had minor scratch's on it from bouncing down the road at 45mph. I got lucky it bounced into the divider. so it didn't get run over.

Anyrated I'll start to put logs up hopefully later tonight for you guys to review.

The most boost I was hitting was 32psi and it was always fine till about 6000RPMS (which is just about when the boost was coming on really strong (typically I'm at full boost/spool by 5800rpms)

Re: Tuning?
 

You probalby just found your air flow problem.

Re: Tuning?
 

I"m hoping that's the case, they are having another Midnight madness again at Moroso this Friday. 6-2am. Temps in the evenings have been in the low 40's high 30's(during the day it's been in the low 70's) lately so hopefully it'll be a nice cool night. (and I'm going to compete in the brackets that way I get in line with the full out drag/rail cars so the track will hopefully be extra sticky.

Re: Tuning?
 

Do you have a wideband on it? If it isn't "seeing" anymore airflow at 30psi than it is at 23psi, then it isn't going to add fuel for all that extra boost.

Re: Tuning?
 

I'll review the logs but I don't think it ever got above 55lbs/min. Typically at 25psi I normally see 53lbs.min And all day that is about what I was seeing, But I rarely got to do a pull over 6200rpms it would start to buck and sputter, so I always backed off the gas. Accouple times I got to about 7000rpms but it was getting pretty bad. I'll have the downpipe back together shortly and then I'll take it back out to see if anything changed.

Honestly I'm really leaning towards the downpipe being my problem (at least at this point) I was running 25psi on pump gas before with no problems at 53lbs/min. Even when I started running race gas at the same PSI I wasn't having this problem. This was my first time taking the car out since I reinstalled my turbo/exhaust manifold with new gaskets. Obviously did not get the clamp on 100%

Re: Tuning?
 

How is the downpipe going to cause bucking and sputtering at that high of RPM? Sounds to me like you have other issues Brian, like running lean.

Re: Tuning?
 

Well going by him saying he lost a coupler, I think he might be talking about the lower intercooler pipe? Just a thought, I dont know.

Re: Tuning?
 

I thought he meant his V band clamp came loose on his downpipe.

Re: Tuning?
 

It was the V-clamp to the downpipe. My 02 sensor is connected to the downpipe not the o2 housing. But then again for the most part the downpipe was connected so it still should have been running fine.

I don't see why things all of a sudden changed, Last time at the track I was running 116oct still running 25-26psi. (cause I thought the EGT's where supposed to go down with race gas) Anyrate The car was running totally fine. I was running 12.0-12.1@116.9mph but pulling 1.9-2.0 60's. Anyrate On the last run I'd upped the boost to 28psi and on that run my turbo-exhaust manifold bolts came loose and I blew the gasket. (was running fine for 1and2 gear, went out in 3rd)

Since then I unbolted the turbo and took off the exhaust manifold that way I could install the 4th bolt for the turbo-exhaust manifold. (prior I was only running 3 bolts which I'm pretty sure is why the other bolts kept coming loose)

Anyrate After that I installed the 18.5lb radiator cap, and the sealed Coolant overflow, blew the alternator fuse, and had to replace my battery.

That's all I changed. I'll take the car out to Bee-Line Hwy hopefully tonight to do some tuning. And we'll see if the downpipe changed anything. I'm hoping that the downpipe being off slightly was causing the 02 sensor to mis-read the air.

But like I said I've turned the boost back down to 25psi which has been trouble free since I installed the motor, and I'll re-load my settings from when I ran my 11.7 and start from there. (Before I go though I'll do a boost leak test to see if my coupler is leaking (the one from the turbo to the FMIC has been giving me problems for sometime so that might be apart of it)

Re: Tuning?
 

I forgot you O2 sensor was in your downpipe and not the O2 housing. I guess it could have been the problem, but unless it was totally just hanging there and not connected at all it should have been giving a reading even if it was leaking. I guess see how it acts tonight and go from there.

Re: Tuning?
 

I did a boost leak test and nothing, except the usual place (SMI came with a small pin sized hole in one of the welds on the #1 runner)

Anyrate It's supposed to rain so we'll see what happens. Worste case senario I go back to pump gas with out ever getting to do a run on Race gas and higher PSI.

I'll be racing on Friday assuming the sputtering is gone. I also have to check the spark plugs. They are brand new with less then 25 miles on them but still.

Re: Tuning?
 

Even a slight leak before the O2 sensor would cause a false reading. All that air flowing by would be sucking more in from the outside. I had a similar problem on a completely different vehicle where the there was a leak before the O2 sensor and it caused some very poor driveability. I am not saying that is is for sure the problem but even the slightest exhaust leak before the O2 sensor can and probably will cause problems.

Re: Tuning?
 

Shit half the DSMs on here probably have the same leak you are describing. I don't think that was or is his problem. But who knows.

Re: Tuning?
 

Well pulled the spark plugs today. Numbers 1 and 4 where completely Black/Wet, and the #2 cylinder that had been giving me problems all those times I posted had Black chuncks on the spark plug itself (looked like carbon build up or something) but the thing is these spark plugs have less then 50 miles on them.

Anyrate I put in some NGK BPR8ES's (they are slightly used about 25miles or something on them) but hopefully they're still good. (local shop that's carring them raised there prices to $3.25ea) and having to swap them out every 20-50 miles will get expensive.

Re: Tuning?
 

OK I deserve to kick my own ass right now.

I just got back from taking the car for a spin now that the spark plugs are changed. to see if she'll be ready for tonights Moroso event.

Well after 20 minutes of driving the cars running awesome. Clutch won't hold 1or2nd gear 3rd is just insane. I'm making my return trip home when I pass a new 05-06 Saleen going the other direction. Thinking to myself so damn typical I've been here over a year and haven't gotten to race anything worth while best race I've had so far was an 03 cobra.

anyrate I'm turning off Beeline Hwy to Haverhill heading home When I notice a Yellow Porsche coming at me that's hugging the ground. I'm like please fallow me and let this be at least a turbo model. And he does. I get on it in 2nd to show some power and that I'm ready to play. He doesnt' budge so I just coast back down and let him catch up. Well it's about 1.5 miles till the road goes from a 1 lane to a 2 lane with a stop light. Now we are both fallowing behind like 4 rent a trucks and he decides to pass me along with 3 of the trucks what do I see, I went to fallow but as soon as I pulled to check the on coming traffic there were cars coming so I just tucked back in. Thinking to myself (damn it there goes my chance on a good race)

Anyrate we're getting to the stop light and all the rent a trucks pull over to the left lane and what do I see infront of me and sitting at the front of the lane with No cars behind him?...... The Yellow Porsche GT3 that had passed me.

I caught him inching forward as the light was getting ready to turn green so I reach behind me turn on the Camcorder to catch the action.... and DAMN IT!!!!!!! I took the power supply back in the house so that I could charge the battery that I'd found after 4 months and never put it back in the car.

He takes off the line I rolled into it he was about 2 lengths a head of me when I went for 2nd. I can see him waiting for me to switch lanes, I do I'm now Mid way through 2nd and I go full throttle hoping my clutch would hold and sure enough it does I'm now about at his rear bumper matching his speed. He's back on it I go into 3rd and just pull away like no tomarrow. at about 4 lengths ahead I see him hit the brakes so I do the same. He pulls up next to me and said that was awesome. It was some old guy probably in his 60's. He's like that's an impressive car... I say thanks, and that's a sweet car also... Wave goodbye and he takes off again. I didn't fallow cause I'm coming up on my townhouse and wanted to let my car cool off.

I'm running 28psi, 116oct and almost out of fuel. And a lot of tools in the car in case something when wrong.

Re: Tuning?
 

So what kind of Porsche was it?

Re: Tuning?
 

Turbo? C2? C4? It'd be a treat to pull car lengths like that on a Turbo 911.

My boss drives a $45k 330i that he's pretty proud of, I put a few car lengths on him today & now I'm kicking myself...why would I want to woop up on the guy that signs my paychecks? Because he deserves it... :)

Re: Tuning?
 

It was a turbo GT3 (not sure if they all are turbo or not) but this one had the turbo badge.

Re: Tuning?
 

weird. Maybe it was a GT2? The GT2's are turbo, rwd, and about 450hp. The gt3 is n/a w/ rwd but *almost* as fast as the awd turbo model. 3.8L (I think) six-pot with about 400hp on tap. Pretty quick!

Re: Tuning?
 

Don't know It for sure had the GT3 embelem on the rear. The high wing of the GT3.

And had the "Turbo" badge on the lower right side of the car. (I raced one at the track when I first got my car running he went 12.1@114mph to my 13.2@103mph