A lot of vaccum.. lol

 

A couple weeks ago we were having some problems with our dyno. I made a post about the AFI 50 trim kit and we had to go toa dyno jet cause our dyno was acting strange.

The problem ended up being in the load cell cable something cut through the wire and it was giving me results that were not right. I would make a run and it would be lets say 280hp then I would make a run with NO changes to the tune and it would jump to like 360 and up and up and up. So I knew something was up.

When I dyno'd this car the last time we thought that we had everything fixed. We were getting numbers that were on par for a 3076 on this dyno untill the end. We hit 430 and that is very very strong for this dyno. The highest I had ever seen. BUT a few runs after the dyno started to make high numbers like 550hp or something crazy so we called it quits.

I then did a full tear down and replaced everything on the dyno including load cell wiring harness and computer to make sure that this does not happen again.


We got the car on and started to make some pulls. First pull we made it was in the 400 range and we thought that to be pretty good. Kept tuning raising the boost and adjusting the meth but the highest we ever saw was 420 hp.

So at 28 psi we stopped and the car sits now at 420hp. I dont think the numbers before were right as this sounds about right for a 3076 on this dyno.

This car is run on 91 pump plus a 50/50 mixof meth and water. After 28psi I could not get anymore timing in the car and it started to show signs of det. 91 octane is just crap gas period it is so hit and miss around here.

Also the MBC is tapering boost. If we could hold solid boost I have no doubt this car would make a lot more power. From 28psi we are tapering down to 25psi which is killing power. The top end is just falling off as you can see on the dyno sheet.

As for the cams there is no doubt that there is more top end and midrange. They have a pretty rough idle but they scream up top.

I will have Guz Man get on here and tell you what he thinks of the cams as he knows better than anyone.

Sheets are in my next post and I can show you what I am talking about with the dyno.

Sorry for the long post and thanks for being patient.

Mitch M

 

Take a look its in a book reading rainbow........lol.



Builds boost later. I think part of what we are seeing maybe a boost leak as well. Customer is coming by today and I am going to check it out.

Thanks,

Mitch M

 

So the car made only 420whp on 28psi on 91 with meth? Can't squeeze anymore juice out of her huh? Well now it comes time for the review....where is Guz Man.....

 

i am here... sorry guys.. i was going reading through the whole thread...
mitch is right.. the cams do scream at top.. ideling is a little agressive.. but it is no issue to me...
me and mitch did a test drive after the dyno last night.. and in comparison to the last time we did the dyno... BIG difference... runs solid.. way increase in power and torque (feel wise), since that last dyno i would guess the numbers were not accurate, but i know for sure.. that i have gained more at the top end than last time..... Mitch even said "holy ****" this is fast.. i told him.. "you think?"...
overall i like those M3s alot.. i am seriously now looking for a EBC and get rid of my MBC... and bring it back to Mitch again..

am gonna go back today again for some small stuff left to be done, and hopefully we will see if there is a boost leak or not..

will update this post with the findings..

thanks guys

 

and yes, for now.. the car runs 420 on 28psi... hopefully after i get an EBC.. we would see both numbers go up a little..

 

thanks for the INFO Guz man
seems like the M3 work well then, i must look at picking up a set when i do the build on the 2.3

 

We are installing a set in Evan's car (ESEVO) right now so I can get hard numbers. They should be done by tonight and will get it on the dyno tonight. If I have to stay untill 5am to get them done I will do that but I want to make sure we get hard numbers so that the community knows the 100% acutal gains.

This time it will be on stock turbo.

Thanks Guys,

Mitch M

 

good results...how hard was it to get the car idle properly with the stock ecu?

 

It wasn't too bad. Fuel trims at idle were a bit funny to get down but they came in line. It idles fine but is very lopey. I would imagine with a standalone idle would improve greatly.

Mitch M

 

thanks for the results and sharing the info with the community by the way

 

Since the customer is happy and it feels stronger, thats all that matters. Bummer about the comparison. Mine should be ready for dyno time in about a week. So, I'll post the comparison between the GSC S1's and the M3's. A little more drastic swap, but it will give us some idea what to look for. Thanks for all the effort vivid and glad you found your issue.

 

there seems to be something wrong with the car. your not making peak torque until 5300+ rpm. thats slower then my 35r. as i mentioned on the phone i highly doubt it is the boost controller as external gates are much stronger then the stock gate (and the 3076 shouldn't taper much to begin with. maybe 1-2 psi tops). i would look into the BOV popping open/boost leak, or possibly a stuck/leaking wastegate not holding the boost. the MBC may cause taper, but it wont cause the very slow spool (its appears to be about 500+rpm slow for a 3076). what do the logs show for when you reach within 10% of peak boost?

i would expect to see 20psi at 4200rpm, and 28psi at 4500rpm in 3rd gear on the street.

also, the torque seems to be a bit low too for 28psi. since you get crappy 91oct gas, use a higher ratio of methanol instead of the 50/50. i would try 75% meth or even 100% meth. you should be running 28-30psi no problem with a good amount of timing as well. there shouldn't be any knock either seeing only 25psi at redline with meth.

hope that helps some.

 

very good point kevin..and thanks for the helpful tips... yes you did mention that on the phone...
actually i mentioned to Mitch that when i turn the HFS-5 off, that will make me run on wastegate pressure, i have the tial Wastegate by the way... and it is 10-12psi only.. you mentioned then that it is probably one of the causes why i taper.. coz i have a soft spring there.. so i mentioned it to Mitch, and he said it makes sense.. so i will call them tomorrow to get me a stiffer spring for the wastegate
i will also get a stiffer spring for my MBC, just in case the stiffer spring in the Wastegate wouldnt be enough

Mitch also ran a boost leak test, and no leaks at all..
and i will switch back to 100% methanol, and see if that would help a little too...

will keep you guys posted..

 

How is this good result when the car is making less HP than the previous set of Tomei PON cams? I remember reading a post on this same car that made 430whp on 26psi; with the M3 cams, it's making 413whp on 28psi and the spool up is much much later...

Do u guys actually analyze these results or just glance at it and say "whorray!!!" ??

Something is definitely not right with this car... check vacuum leak my friend Either that or the dyno is not reading right