Does your APR car surge??

[RhysQ]

The other way is to fit a water spray on the intercooler.

that's crap. Kai fitted one to his Polo GTI and he said it did sweet f**k all.

You can cut a vents out behind the cooler for better air flow, you can connect a water spray.....neither has a significant affect on heatsoak. The standard SMIC just doesn't have the flow capacity to eliminate heatsoak. The only way is a larger FMIC.

[pologti18t]

that's crap. Kai fitted one to his Polo GTI and he said it did sweet f**k all.

You can cut a vents out behind the cooler for better air flow, you can connect a water spray.....neither has a significant affect on heatsoak. The standard SMIC just doesn't have the flow capacity to eliminate heatsoak. The only way is a larger FMIC.

Is that why Subaru fits one to the STI then.....

And as the article states (you did read it ?) its all depends on when you spray the intercooler.

[VW GTI]

From memory the STI spray is actually cooled water isn't it? So it's really cooling the intercooler down.

[Dukzzz]

Bump!, I recently got a revo stage 1, and i have exact same problem in 3rd gear too!

[noone]

4 year bump... Nice...

Talk to your tuner, something is wrong (could be a split pipe or the tune has highlighted an issue).

[VWindahouse]

Still got a stock DV??

[Dukzzz]

I've got forge splitter , it holds boost fine . I bypassed the n249 today as well and it still surges. Seems like waste gate actuating to often, I'm guessing a n75 j or h might help the condition. I've also read values for mvb 115 and the the pressures are a steady 1.2-1.4 bar. Leaning towards a n75 now , not sure to go the j or h. Or even wire in a mbc

[h100vw]

I've got forge splitter , it holds boost fine . I bypassed the n249 today as well and it still surges. Seems like waste gate actuating to often, I'm guessing a n75 j or h might help the condition. I've also read values for mvb 115 and the the pressures are a steady 1.2-1.4 bar. Leaning towards a n75 now , not sure to go the j or h. Or even wire in a mbc

If you have logged it with VCDS you have the capability to check the N75 duty cycle too. What's that doing?

There should be no need to spend money on an MBC or a different N75. Most software is written for standard hardware, deviating from that without checking with your tuner isn't what I'd recommend.

Gavin

[Dukzzz]

I'm not running vcds, so not to sure which block is for n75 duty cycle. I have access to all channels and mvbs via computers at work. Perhaps you can point me in the right direction for which mvb to look at for duty cycle. Thanks !

[h100vw]

Best if you can log 003 115 and 118 together. This is one run that we use when testing cars, 3rd gear from 1500 revs wot. No need to get locked up but over 5000 revs works, especially if that shows up your surge.

Gavin

[Dukzzz]

Thanks ! Will see how it goes

[h100vw]

Run one of 020 031 and 115 together as well. Timing pull, lambda and boost in one.

[noone]

I doubt changing your N75 will fix it, check the vacum pipes around the top of your diverter. they can wear there (expecially with the splitter). Visually check all your vac pipes, its free.

[Dukzzz]

I've checked all vacuum , first thing I did. Ran 115 to make sure requested and actual was neck and neck most if not all the time , so guessing that doesn't Indicate a leak. To me it feels like too many waste gate actuations, but like Gavin said I'll be checking the duty cycle later . Sounds like a typical over boosting issue on 1.8t. Having said that most softwares are okay nowadays, I'm guessing my revo might be out of date compared to others say custom code

[Dukzzz]

Hello ,

Wondering if i could get some thoughts on the following logs, and the last image showing N75 @ 100% duty cycle although nothing is requested, over the period of a 30 min drive, there are 3 other occasions where the N75 is @ 100% duty during idle > could this indicate a N75 fault? :







Kind Regards

Andrew