Message for John e89

[Dave 2 dogs]

Hi John
I see in you car stats , that apart from the wonderful eisenmann RACE exhaust ( good choice) it says VRSM down pipes inbound, wonder if you want tell me more about these please? ( or if anyone else cares to ) I’m pretty much done with the body mods , and am now interested in what you guys have done/ doing to Uber the bonnet. Thanks John 🏎

 

[Dave 2 dogs]

UNDER the bonnet ( sorry

 

[buzyg]

:lol: It's pretty Uber under the bonnet on a Z4MR.

 

[Dave 2 dogs]

Do these still pass an mot ??

 

[B21]

Do these still pass an mot ??

I think you are referring to VSRF catless down pipes..

If fitted to a stock 35i / 35is exhaust system with secondary cats further downstream then subject to an Italian tune they should pass..just..

If fitted to an exhaust system without secondary cats will fail by a country mile.

 

[john-e89]

Hey Dave,

The 35i is just mapped to 365bhp, Pulls like a train tbh, certainly wouldn't do anymore without a quaife diff. I contemplated selling it to another member who wanted it pretty much stock so held off the VRSF's, however after the blackouts and not being able to drive I'm keeping it to do a full on show and shine job on it along with more mods, including the downpipes. Chassis mods are M3 front control arms, front thicker anti roll bar, M4 front 4 pots, KWV3 coil overs, and the race exhaust. Totally transformed the car Dave, you'll never get an E89 brilliant but it's soooooo much better.

 

[mcbutler]

I have the VRSF catless downpipes on my 35i running MHD stage 2+.
The pipes add about 24BHP and I have passed two MOT's with them fitted by a good margin.

 

[Dave 2 dogs]

Thanks to all that replied
John - i have mine mapped also to same as yours or there abouts . So, your saying… do the quaife LSD first , then think about the down pipes ?
B21 mentioned about second cats and Italian tune ?
I also have the eisenmann race exhaust. So , John , it should be the same as yours. Does your one go through the mot ok ?
B21 what do you mean by Italian tune , and yes , I did mean VRSF down pipes, thanks for pointing out I’d wrote it wrong

 

[Dave 2 dogs]

In another note John
Had no idea about the blackouts
Sorry to hear about the driving my friend. I hope it’s something you can sort and get back in the saddle

 

[B21]

Thanks to all that replied
John - i have mine mapped also to same as yours or there abouts . So, your saying… do the quaife LSD first , then think about the down pipes ?
B21 mentioned about second cats and Italian tune ?
I also have the eisenmann race exhaust. So , John , it should be the same as yours. Does your one go through the mot ok ?
B21 what do you mean by Italian tune , and yes , I did mean VRSF down pipes, thanks for pointing out I’d wrote it wrong

The general consensus from my MOT man that does quite a few tweaked cars is that depending on the tune often these cars with parts of the emission system removed often will get through if the car is tested straight after a good run…

As an example my N20 powered E89 passed the emission test by a factor of 20-40 times with the one and only cat..

With no cat it failed by a factor of 2-4 times.

With a sports cat (200 cell cat not 400 cell) it passed by a factor of 2-4 times..

So no rally with full cars these cars pass by a very big margin..once they are twiddled with they become more borderline..

FWIW I dyno’d my 35is with and without VSRF under controlled conditions..it made 10 BHP more with the de-cat..

Removing the airbox gave 8 BHP advantage..

So a 35 with say MHD stage 2+ on 98 Ron fuel with a de-cat and some form of filtration will be around 400 BHP and 650nm on the latest V10 maps..

 

[john-e89]

Thanks to all that replied
John - i have mine mapped also to same as yours or there abouts . So, your saying… do the quaife LSD first , then think about the down pipes ?
B21 mentioned about second cats and Italian tune ?
I also have the eisenmann race exhaust. So , John , it should be the same as yours. Does your one go through the mot ok ?
B21 what do you mean by Italian tune , and yes , I did mean VRSF down pipes, thanks for pointing out I’d wrote it wrong

Pretty subjective topic Dave, but as you and I seem to be about identical on power, the VRSF downpipes would be the very last mod I'd make without an aftermarket diff, and I'd make that mod purely for a better exhaust note, as I doubt you'd feel much difference over a stock exhaust in the real world, however saying that I'm not in a position to argue with those that have them, just my own thoughts . So yes, I'd fit them without a quaife diff , but that doesn't make me right. As for the MOT it went straight through no issues with the Eisennmann. Maybe food for thought mate. In summary I guess if your noise and power levels are acceptable to you then don't waste the money on downpipes, if you're chasing noise and ultimate power with a no cost option then Peter and others here make a no argument case for them. I guess as usual it comes down to expectation and money, for me I'm pushing the E89 chassis to its limits, but as I haven't tried a diff I'm very open to be corrected and certainly not suggesting I'm right.

 

[john-e89]

This is going to sound confrontational which I don't mean it to but personally I don't get an E89 pushing much more than stock 35is power levels even with chassis upgrades, it simply cannot handle the power that can be wrung from that cracking engine, it's just my thoughts but any more power than 35is stock means straight line power only, fine if that's your bag but stock power is more than enough to overwhelm the chassis, any more is just number chasing or straight line drag racing Influenced. That said nowt wrong with creating an ultimate car in the owners eyes.

 

[Dave 2 dogs]

Thanks guys
Interesting read
I’ll go with the quaife diff after I’ve saved my pennies . And think about the pipes from there. I only do around 2.5 ka year in this. But yes John your right, the pipes for me would be firstly for exhaust note and secondly for any more power.
Always nice to have a bit more noise
🏎

 

[Dave 2 dogs]

On another note , what’s the thoughts on the 35i engine and gearbox being able to hold up against a stage 2 map ?
And what would it give compared to 365 ATM

 

[Dave 2 dogs]

Think B21 answered that question actually

 

[B21]

On another note , what’s the thoughts on the 35i engine and gearbox being able to hold up against a stage 2 map ?
And what would it give compared to 365 ATM

Is it manual or DCT?

 

[Dave 2 dogs]

Dct
Because I’m a lazy bugger !!!

 

[B21]

So the DCT is Getrag's GS7D36SG..there were 4 versions..the E89 had the first version.

BHP is not the issue with gearboxes its torque.

35i has 450 nm as stock and 35is has 500nm through overboost.

The clutches are controlled by pressure at up to 17 BAR which is alledged to related to 600 nm torque.

Other boxes have an 18 BAR limit which relates to 700nm torque.

My 35is on a MHD stage 1 tune V9 made 562nm, on a stage 2+ V9 made 591nm and on stage 2+ V10 made 648nm

So for this and other good reasons xHP is your friend..with a 19 BAR limt it can do 800nm+ and now, released 20 BAR for 1000nm..(stage 3)

That is if you tune it..

What's very important at this end of town is that the tune and the gearbox talk in full to each other..so piggy back tuners and back street maps are a really bad idea as the geasrbox may not realise how much torque is being produced and as a result does not applye nough clamping pressure..once DCT clutches slip they burn out very fast.

Auto boxes like the ZF 8HP have torque limiters which saves the box from its own demise..the DCT hasn't got them.

xHP allows you to place torque limits but without a dyno you don't know whether you are skirting close to the edge..

My new turbos are predicted to make around 735 nm so a 19 BAR limit should work nicely.

I spent the day tweaking xHP and MHD and I've got it to a very nice place in terms of smoothness, response and performance.

 

[Dave 2 dogs]

Thanks B21

 

[Dave 2 dogs]

Meant to ask you John E89
Eisenmann race exhaust… did you go QUADS ? Or twins ?