Boost it baby!

[Squiffy]

Just looking around at the beezer cupra's out there on this site, mine is jabba'd and runs 15psi max boost at any time but i see that a lot of the Revo gear run in the 20's. Its just that i remember mike saying that anything over 1bar on the tiny beezer turbo is just making heat and not really achieving much more power, i'm starting to think that i'm missing out here!!! whats the deal, can anybody enlighten me ?

(sorry if this has been coved before, i cant find the info through the search)

Many thanks

Adam

 

[Dormouse]

Jabba's and REvos' maps work quite differently i'm sure. The proof in the pudding is not jut boost. Have you had it Rolling Roaded? A plot of that would be worth seeing.

Dor.

 

[Copra]

it seems the revos 'spike' at around 20psi, but tail off to around 15psi, and the jabba is more constant at 15psi..i think!!
Mark

 

[Garth]

Originally posted by mk4polo
it seems the revos 'spike' at around 20psi, but tail off to around 15psi, and the jabba is more constant at 15psi..i think!!
Mark

Correct. I have Revo and it does spike at about 3000rpm. Not really ideal as it takes more practice to get the power down without the wheels spinning. I wouldn't worry not having higher boost. Your car should still be quicker in the real world.

 

[Madmile]

In general the higher the spike the less boost will be sustained higher up the revs. Not exact but 16psi spike with 11psi @ 6500rpm, 20psi spike with 8psi @ 6500rpm. I dont think Revo bother to map for top end power as how often do you do 130mph+ i may be wrong and i am sure someone will correct me.

 

[Copra]

i see what your saying yeah, although mine never goes as low as 8psi, it spikes at about 20psi, and tails off to 15psi sometimes 16psi.
I like the spike the revo gives, makes you 'feel' the acceleration, but i agree it makes it harder to put the power down. Its all great fun though isnt it!
Mark

 

[Madmile]

You have a 20psi spike and still see 15-16psi @ 6500rpms and above. Do u have a boost guage in your car, is it working. K03 making 15-16psi @ 6500rpm's and above is fantastic, whos software you running i want it!!!!.

 

[BenS1]

Its interesting that before Revo most tuners used to map upto a max of about 15-16psi on the Ibiza. They were fully capable of increasing the boost even more, but they said that reliability may suffer and as mentioned above only more heat will be produced.

So if thats what all the tuner said a couple of years ago then why are they starting to up the boost now?

The cynic in me says its just marketing. ie. you will probably get the same power output from 16psi as from 21psi... the only difference is that at 21psi more heat will be generated, but of course it sounds like 21psi would be more powerful that 16psi.

What Jabba said sounds correct to me, and I can't think why they would lie about it, because they could easily up the boost if they wanted so theres no need for them to make up excuses.

Also, why exactly does Revo spike? Its better to have a smooth linear boost graph, so why do they have the spike? I know that my Oettinger chip has a big spike, and the effect is that the initial kick makes the car 'feel' more powerful, but ultimately you would get a better 0-60 time without it.

I can't understand the logic of saying that the bigger the inital spike the lower the final boost will be at 6500rpm. Why would a boost spike result in a lower boost at high revs?

Cheers
Ben

 

[Madmile]

You answered your own question Ben, race a Revo'd Ibiza and watch it go backwards at 140mph, probably heat soak from that nasty early boost spike.

Horses for courses.

Sim did a lot of testing with boost spikes, and mike @ jabba told me the same. I would take mikes word for it.

 

[m0rk]

so @ 140 you think that heatsoak is a major issue?

cough

bollocks. come back with 'facts' not m-way heresay

 

[Madmile]

Originally posted by m0rk
so @ 140 you think that heatsoak is a major issue?

cough

bollocks. come back with 'facts' not m-way heresay

Accelerating to 140mph running high boost will result in heat soak. Higher the boost higher the induction temp and heat soak.

 

[Madmile]

Originally posted by m0rk

cough

bollocks. come back with 'facts' not m-way heresay

I guess you miss out the 0-140mph phase. cough

Originally posted by m0rk

 

[Dormouse]

Originally posted by m0rk
so @ 140 you think that heatsoak is a major issue?

cough

bollocks. come back with 'facts' not m-way heresay

I'd be more worried about aerodynamics at 140

I'd guess that the I/C would be getting pretty well cooled at 140 too!

Cheers

Dor.

 

[Squiffy]

Cheers chaps

Thanks for the info most of it makes sense to me and its reassuring cos I know my car is quick and holds boost very well, its hard to imagine the tiny turbo delivering anymore without a better intercooler at least. It’s quick enough for the roads around me for sure and I also have the added advantage of having a golf cam which delivers a slightly different power curve than STD, its all good imho.

chears

Adam

 

[Copra]

I can't understand the logic of saying that the bigger the inital spike the lower the final boost will be at 6500rpm. Why would a boost spike result in a lower boost at high revs?

i dont see the logic there either. a spike is a spike, not sustained, so i dont think it would produce SO MUCH more heat it will affect boost higher up the rev range?

Also, my car has apparently had the wastegate (??) adjusted (??) which makes it boost a little higher - so ive been told by a tech at the seat dealer... (??)

Yes i do have a boost gauge fitted, how the hell would i tell the boost figures otherwise?...and yes it works, agian how would i tell otherwise dude!?

And just for the record, i dunno why your doubting me-why would i lie? when im nailing the trottle, it spikes at about 20/22psi and tails off to about 15psi...thats that. i dont understand why you assume im either wrong, or just lieing...??
Mark

 

[Madmile]

Originally posted by Madmile
You have a 20psi spike and still see 15-16psi @ 6500rpms and above. Do u have a boost guage in your car, is it working. K03 making 15-16psi @ 6500rpm's and above is fantastic, whos software you running i want it!!!!.

Maybe you used vag com to log boost not a boost guage, and like i said who's software u running i want it and where does it tail off at (revs wise). At no point did i question what u were saying.

Also at 140mph heat soak may not be an issue, but how do u get there?. Other than through the gears.

 

[Copra]

its just revo software, i run on optimax and the 'optimax' setting (98ron on my SPS2) and like i said the wastegate has been adjusted, apparently that gets a psi or 2 more, but i wouldnt ever have had that done myself....
seems a bit gash if u ask me! cheating almost...
as for 140mph...how often do u get there-ive creeped past it ONCE showing a BMW 3series not to mess, but it wasnt a relaxing feeling thats for sure!(on my private road as im sure your all aware )
Mark

 

[Madmile]

Originally posted by Madmile
how often do you do 130mph+ i may be wrong and i am sure someone will correct me.

I messed about with my WG actuator setting, bringing my boost spike down from 20-21psi to 18psi and the car feels better top end for it.

 

[Madmile]

Max speed i have seen on the speedo is 151mph. On my private track.

 

[Copra]

151!! ouch!!
Mark