Jump to content
SAU Community

Recommended Posts

Hey guys,

this is a question out of curiosity not whinging....anyway..

had my car tuned recently and seeing how it responds to holding a constant throttle of 3000rpm+ where my stock turbo has the potential to be @ full boost and then rolling onto throttle vs instant WOT.

I found rolling onto throttle pulled much harder intially compared to WOT which i was expecting.

However i expected using instant WOT to then after hesitating, start pulling just as hard as rolling onto boost but it seemed to pull the same all the way to redline.

So im curious whether thats just the case for turbo cars or its due to my "inferieor, peice of shit, why dont you get a real ecu, SAFC II tune"

Cheers

Pic for all the safc haters :)

post-88652-0-55376900-1368695210_thumb.png

It just feels like it is being more responsive when you roll on... I'm sure of you grabbed a stop watch you'd be surprised.

It just feels like it is being more responsive when you roll on... I'm sure of you grabbed a stop watch you'd be surprised.

Could be but its quite a noticable difference between being thrown back or not.

Just had car tuned.

Still hesitates...

And you're happy with the tune?

Hesistates may be a poor choice of words.

Cruising above 3k rpm if i then go straight to WOT it will still pull, but incomparison to cruising at the same rpm then rolling onto the throttle to reach WOT, it doesnt pull as hard.

Id expecting rolling onto throttle to reach WOT as opposed to instant WOT to respond better initially but it seems going from cruising to instant WOT makes it pull less all the way to redline not just initially "hesitate" to pull as hard.

I think you're just feeling the sudden rush from the boost build up when you mash the pedal.

Like Joeyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy mentioned, just use a stop watch

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Latest Posts

    • They care about emissions, and cost the most. Save weight where possible, and make manufacturing easier. Less material also let's the engine transfer heat to water quicker, and bring the engine up to temp quicker, better for emissions and getting them past their warranty period.
    • I was under the impression the reason why OEMs are going with solutions like relatively thin "right-sized" cylinder walls with technologies like PTWA and open deck is because they care a lot about whatever marginal knock margin benefits they get from that vs the structural rigidity benefits of a closed deck block and thicker cylinder walls. I also see some weird stuff like plastic inserts in the water jacket around the cylinders to try and equalize cylinder wall temperatures. re: the PRP blocks and heads at the end of the day it's hard to know what is and isn't going to work there, just have to see what the initial buyers say about it.
    • Which is why I didn't mention that hardness testing, and specifically mentioned the bore and deck thickness testing. Yeah, not really. The bore temperature will be a lot more even around the top half inch or so, where the material distribution is dominated by the deck, and which is the only place where the bore surface temperature heating any gas in the cylinder is likely to have any effect on detonation. Think about it. Another inch or so down the bore, you might have a hotter spot. The gas there might get a bit hotter, then the piston rises squeezes that gas away from there at high speed and mixes it with other gas from nearby. Instant dilution of the problem. I'd be surprised if it was an issue at any time other than in racing engines or OEM dev engines being run at the ragged edge of tuning. Say what now?
    • https://dsportmag.com/the-tech/education/engine-tech-material-hardness-testing/ The PRP testing on block hardness I'm not sure how much it actually can be trusted. The thinner cylinder walls on RBs is a bit of a problem vs 2JZ but it really depends on the design goal. Siamesed cylinder bores like a 2JZ cause uneven cylinder wall temps too, which means a bit of distortion induced by that + the hotspot can affect knock margin. Something that actually gives me a bit of pause with the PRP block, whether super thick cylinder walls are going to keep it from being drop-in compatible on an otherwise OEM rebuild. 
    • Yeah very valid point. I am waiting for one of the other tuners to come back from vacation so he can help me a bit when the cat is installed again. In the meantime I am going to finish up my polishing and ceramic coating that I have started myself.    N45 Dr Beasley product is highly recommended for a paint primer / polisher. Using this EXO Gtechniq also for the ceramic but next time might use the light serum before hand also. Looks great. 
×
×
  • Create New...