C_DirtyTwo

Got my car dyno'd tonight. The best run was the first at 325whp and like 311wtq I think....I will post up the video and dyno sheet when I get it.

Dyno was a Dynojet.

Mods:
185mm pulley
Eurocharged heat exchanger
Eurocharged tune
NeedsWings PSK
NeedsWings IC isolation kit
Full SL55 intake
2ndary cats and resonator delete

My IC pump seemed to cut out on the way home, which could be the problem. But the weird thing is, sometimes on acceleration the supercharger is one but the car is just sluggish and slow in response. I have been having that TB issue up until recently, but is that back now too? The car sounded mean, like it was running good on the dyno but put no power down.

This is my second Johnson CM30 pump, no way this one went bad already...

It also appears my car leans out on the top end.

Any suggestions? I thought for sure I'd be at around 350whp at least.

AMG3.2

Yeah, those numbers do seem quite low. Here's a dyno graph from Eurocharged's website... You should be making more than the claimed 333.9 since you have other mods.

http://www.eurocharged.com/graphs/c3...Tuned_Dyno.jpg

MIKESV8

+1 you shouldn't have only 5 more rwhp than me

jturkel

well....i hate to bring up it up, but you need to focus on the actual important numbers:

what was your baseline dyno when stock?
what were your numbers this time (or over previous dynos with different mods)
what were the conditions like this time, and last (and other) time
and was this on the same dyno as before (asuming you did a baseline)?

bottom line is: it's all about the DELTA. not all cars are going to dyno the same, and not all dynos are going to give you the same numbers. it's about the DELTA

Newzchspy

Hey, arent you supposed to be studying or something??

Dynos are all different, the real dyno is the qtr mile for me..........

jturkel

lol. i was done for the night...and ob/gyn was making me nauseous. haha

C_DirtyTwo

Well I did not do a pre-dyno, this was my first dyno with the car. I am waiting for him to email me the graphs, but you'll see a weird spike and the top end A/F ratio...

A 535 dyno'd that night and almost made as much power as my car...there has to be something wrong with it. I think I am in need of a boost gauge to see if it's even making full boost.

jturkel

have you ever gone to the track? perhaps you could compare your time slips/trap speeds before and after this modification

also, 535's can make plenty of power. they've got the twin turbo six that can be easily modified (same motor as 335/135)

i suppose you can check your boost level....but i really don't know how much that will help if you have an underlying problem

C_DirtyTwo

Just did a quick test. Codes for pressure sensor, and intake air temp too high check coolant pump.

And it was a new 535, which I was told only has one turbo.

I have gone to the track before but the times weren't good due to wheels spin. I suppose I could go back and see.

C_DirtyTwo

Just tested the Johnson CM30 pump and it's bad. This is my second one that has gone bad in less than 50k miles. WTF!!!

MIKESV8

correct, n55 instead of the n54.

c32AMG-DTM

50k miles each? or for the pair? either way, that's not great longevity... but not awful either. Maybe for the next one, make sure the system is very, very thoroughly bled post-install. I wonder if the IC isolation kit makes this more difficult, to some degree?

loudandheard

I put in a new bosch pump about 50k miles ago and I think it maybe going bad. So the bosch is no better of a pump. I was reading about an updated bosch pump, anyone know anything about it?

FrankW

don't matter...they still make plenty of power.

my family friend's 135 baseline dyno 265rwhp/283tq and 302rwhp/357tq with tune on dynojet.

keep in mind dynojet is notorious for low numbers.

c32AMG-DTM

First I've ever seen that claim... personal experience is that they're pretty accurate, but most guys seem to think DJ numbers are unrealistically high...

Gramma_Benz

Ditto that

C_DirtyTwo

Both Johnson's I've had have not lasted long at all. I'm saying MAX 50k miles for both pumps combined! I think its more like 20k....This newest one I put it at 102k miles and now I have 122k! thats only 20k miles for the pump. Just ordered a new one though....I dont think the IC isolation would have anything to do with the pump's premature failure.

Yeah, from what the shop owner said their dyno usually reads high if anything...



Verdict: Ordered ANOTHER Johnson pump (This will be my THIRD one), and the B28 Pressure sensor. I am going back with a bag of ice to cool down the intake manifold before the run, and some good shell v-power 91 gas. Costco gas FTL. Also, going to get the OBDII wifi and REv to monitor IAT's, boost, and A/F ratio's.

If it still puts down 325whp then I will accept it. But I am hoping that's not the case.

Gramma_Benz

When I was having TB problems, I got my TB rebuilt. Afterwards, I got a dyno tune and experienced lacking power sometimes still. We sent the TB back and had them re-do it and it's been great ever since. Not saying this is your problem, but sounds similiar to mine.

Good luck!

FrankW

personally i think the dynapac is most accurate since it is straight to the hub without wheel & rolling drum difference.

moosejaw

Ditto on Dynopac
Op do you have a boost leak?
My old car with tune, C3 Pulley, and shorty headers made slightly more power on a dynojet AND it too had a boost leak

c32AMG-DTM

Dynapack does seem to be a good solution, especially for live dyno tuning. That said, I wasn't remarking in any way on what dyno is or isn't the most accurate. I was simply commenting on your observation that Dynojets are "notorious for low numbers" - I've never seen anyone claim that before. That's all; no biggie.

C_DirtyTwo

I had TB issues and replaced it with a used E55 TB. The TB worked great for a little but then started having the same symptoms as the old one. I thought I might have had another one go bad, but thanks to c32kompressor's DIY I zip-tied the plug and its been working great ever since.

I suppose I could have a boost leak...is there a way to check?

ddtham

+1

I did a dyno and mine has similar mods to yours, sans SL55 Intake (I have C3 instead). Mine dynoed 285whp and 320tq on a Mustang dyno. The car runs normal to me, but it would be interesting to see if there's a way to check boost leak.

C_DirtyTwo

I guess a way to check it would be by having a boost gauge and seeing if its spiking like it should be. I just ordered the Needswings rubber/cork intake manifold gaskets which should help solve the boost leak issue if there is one.

mrobinso

@ the OP, do let us know once you install the new pump and how it turns out. Sounds like you have the coolant split system but do you worry about the Johnson's higher flow damaging the IC? I am about to install the CM30 in my SRT6 and am a bit concerned.