Cayman S poor dyno results?

Cayman S poor dyno results?

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Stelongy

Original Poster:

50 posts

142 months

Wednesday 11th June 2014
quotequote all
I've got a 2008 Cayman S, I recently fitted the ipd intake pipe, 82mm ipd plenum, gt3 throttle body, bmc air filter, removed intake blanking plate and remapped the car using winol.

Still got the dyno and standard exhausts but it only pulled 302bhp and 261 ftlb
The dyno used is a 'releastic' dyno and doesn't over emerald like some I've used in the past, am I to believe a exhaust will make a huge jump in power? I've seen people getting 340-350bhp with the same mods (with a exhaust though)

My dyno



My AFR



Another chaps dyno (hope he doesn't mind me using it)



Interestingly, my dyno follows the same curve and dips as his car did standard, albeit more pronounced on his car.

opinions?

edc

9,230 posts

250 months

Wednesday 11th June 2014
quotequote all
What did it do on the same dyno before you bolted this stuff on?

I have done the same sort of thing on a 986 and got some real measured improvements.

Stelongy

Original Poster:

50 posts

142 months

Wednesday 11th June 2014
quotequote all
I wasn't able to do it before unfortunately.
Although obviously that would have been my preferred method.

I'd hoped for around 320-330 bhp though tbh, I'd be surprised if the exhaust was that restrictive. I suppose it does have 4x cats though!

OlberJ

14,101 posts

232 months

Wednesday 11th June 2014
quotequote all
Doesn't matter if you've got a cracking set of lungs on you, if you're blowing through a clagged up straw you ain't going to be able to make good use of them!

Everything needs to be balanced.

edc

9,230 posts

250 months

Wednesday 11th June 2014
quotequote all
Very peculiar scale on the AFR chart as well.

Stelongy

Original Poster:

50 posts

142 months

Wednesday 11th June 2014
quotequote all
Yeh I know it all needs to be balanced, and I will be getting an exhaust the removes 2x cats.

I'm not new to tuning cars, but just thought I'd see what people thought about the exhaust causing such a high restriction.

Why do you think the AFR isn't right? Granted its a little conservative but it's a nice smooth AFR (as you'd expect being a wideband lamda)

edc

9,230 posts

250 months

Wednesday 11th June 2014
quotequote all
I didn't say the AFR wasn't right, but that the scaling on the graph is not very helpful. It's difficult to make out how smooth it actually is. But, that's neither here nor there as it starts in roughly the right place and finishes in roughly the right place.

Stelongy

Original Poster:

50 posts

142 months

Wednesday 11th June 2014
quotequote all
edc said:
I didn't say the AFR wasn't right, but that the scaling on the graph is not very helpful. It's difficult to make out how smooth it actually is. But, that's neither here nor there as it starts in roughly the right place and finishes in roughly the right place.
Ahh yes, sorry, I misread you're post.

edc

9,230 posts

250 months

Wednesday 11th June 2014
quotequote all
Again, different car but on my old 986S I did exhaust/manifolds then intake/throttle body then remap and at each stage saw dyno gains. A friend with the same car did the intake/throttle body first and saw no improvement. Both cars on the same dyno with before and after runs.

Stelongy

Original Poster:

50 posts

142 months

Wednesday 11th June 2014
quotequote all
Ok great, thanks for the info.
I'll do the exhaust and see what difference it makes.

Looking at a remus exhaust up to now

mrdemon

21,146 posts

264 months

Wednesday 11th June 2014
quotequote all
All that extra air in , no where for it to go

That's my graph you quoted and it was real, I had the Remus.

You need to delete some cats :-) it will net you another 15bhp.

On a gen one just fittin an exhaust back box alone nets you 10 real Bhp.

Stelongy

Original Poster:

50 posts

142 months

Wednesday 11th June 2014
quotequote all
mrdemon said:
All that extra air in , no where for it to go

That's my graph you quoted and it was real, I had the Remus.

You need to delete some cats :-) it will net you another 15bhp.

On a gen one just fittin an exhaust back box alone nets you 10 real Bhp.
I'd still be hoping for more than 315bhp with all those mods (plus the exhaust)

mrdemon

21,146 posts

264 months

Wednesday 11th June 2014
quotequote all
well, with out a base line you will never have any clue what you started with on the same dyno

both mine were done on the same dyno with out the owner knowing why or what I had done 1 day after the other.

exhaust is key on the gen 1 car as it the remap, Softronic is tried and tested with these mods 40x over.
ANd with deleting the 2 rear cars the air is just got getting out.

some one went to DMS and posted a Cayman tune they netted 5bhp !!!! lol pointless.

I also did not go the ipd route and went with 996 GT3 parts, again tried and tested, so why did you buy other stuff ?

Stelongy

Original Poster:

50 posts

142 months

Thursday 12th June 2014
quotequote all
Unfortunately I was unable to do a base figure run :-(
Obviously, that would have been my preferred way of doing it.

I know a exhaust will help, and that's already next on the to do list.
What I was asking is that with all my current mods, am I really likely to see a 40bhp with an exhaust at this point.
I'm looking to get the remus exhaust up to now.

I went the ipd route as I thought this was tried and tested too, are you saying the genuine porsche parts yield a better power gain? (Obviously my gt3 t/b is genuine porsche/Bosch)
I got all the parts very cheap too which is also another reason.
The remap was also very cheap through a German friend that does lots of sports + prestige cars, there where changes like it's fuel pressure is up 3%. Fuel flow limiter is up. Mixture is slightly leaner and timing is a bit more aggressive, the rev limiter is up from 7210 rpm to 7468 rpm.
He also remapped my friends 325d bmw and that's got 255bhp (more than most other similar cars he's put it up against comparatively) so hopefully he knows what he is doing.

The map cost me £245, a damned sight cheaper than softronics £755 too, plus he will tweek it for free if needs be.
The AFR looks to be spot on though (as you'd expect from wideband)

Obviously if I can't get the results with his mapping I'll buy the softronic, but considering no body seems to have dynoed the car with my current set up, we can't account for what the exhaust will produce/free up.

Searching for the cheapest place for a remus now!

I'm not chasing bhp figures btw, but that's just a pretty big difference from what is hoped!

Edited by Stelongy on Thursday 12th June 08:08

OldBob

290 posts

158 months

Friday 13th June 2014
quotequote all
Did you mention whether the car is pdk or manual? PDK doesn't always dyno well ime. Not necessarily less power at the wheels or crank, just the interaction?

Stelongy

Original Poster:

50 posts

142 months

Friday 13th June 2014
quotequote all
OldBob said:
Did you mention whether the car is pdk or manual? PDK doesn't always dyno well ime. Not necessarily less power at the wheels or crank, just the interaction?
It's a manual car, thanks for the reply though :-)

mikep240

78 posts

147 months

Friday 13th June 2014
quotequote all
I'm lucky enough to own a Superflow 902 Engine Dyno. The discrepancy shown between the SF and the other Rolling Roads is quite typical of what we see when comparing numbers.

The worst case we saw was 181 flywheel horsepower on a well known brand of RR, which showed barely 150 on the engine dyno. The AFR chart looks fine to me, though it has been set on a wide scale to make the line a little flatter. Bear in mind that with SF kit, every parameter is logged at 100hz, so it really shows when something is out.

I have every faith that the numbers shown for power in the post above are correct. We calibrate our kit before, during and after each engine has been on the brake. To date, the largest discrepancy has been 0.4 ft/lbs on 300 ft/lbs calibration weight! I guess the best way to judge the engine in question, is to drive it and see how it feels.

fioran0

2,410 posts

171 months

Friday 13th June 2014
quotequote all
aahh, that dyno sheet brings back memories




Edited by fioran0 on Friday 13th June 21:58

keep it lit

3,388 posts

166 months

Friday 13th June 2014
quotequote all

wink

mrdemon

21,146 posts

264 months

Friday 13th June 2014
quotequote all
fioran0 said:
aahh, that dyno sheet brings back memories




Edited by fioran0 on Friday 13th June 21:58
Yes and nothing wrong with it,

There are people on here in gen 2 cars pushing 365bhp+