Lag Problems Rb20/hks 2530

[huddy]

hey guys

wanted to do a little write up about the ceff and the lag problems it has had. fitted a hks 2530 for reason of minimal lag and reasonable power output achievable. with supporting mods - fmic / 2530 / pod / zorst / bleed valve / fcd / bov achieved 225rwkw!!! but it came with massive lag --see dyno graph

so to sum it all up wasnt very happy with it - changed things along the way to 'test' and make it less laggy - slowly but surely and on a budget this is the results 213rwkw (but more fuel added for safety)

things that were changed to assist in helping the power delivery come on a lot earlier were

-hks evc III

-hks 1BAR adjustable actuator

-nismo lightened flywheel

it probably doesnt sound like much but the difference is ridiculous - originally boost wasnt hitting hard until you were pretty much on the limiter! and this was in second gear!!!

another thing which i was surprised about was. i was able to borrow a remapped computer from a mate to suit rb20 and hks 2530 and doing power runs on standard comp with HKS FCD and straight after swapping to remap the results were IDENTICAL!!! so stock computer it stays

anyway hopefully now i can focus on 'driving'

thanks to ppl who helped with it all - RYAN / TERRY / SIMON / LYNDON

so just beware the hks2530 on rb20det may not be exactly your choice in turbo upgrade and if upgrading i wouldnt mind seeing how a hi-flowed steel wheel rb25 turbo would be...

[dangerous_daveo]

So you got an improvement from a lighter weight flywheel...

Interesting.

[QUIKBLADE]

With those added bits and pieces, obviously you had more control over the boost cycle in each gear etc using an EVC, but was there and increase or decrease in your torque figures? Where you running identical boost pressure with each dyno run, basically, looking for a reason for the 12KW loss...??

[huddy]

the loss of rwkw - was from more fuel being added as it was starting to get a little lean on 225rwkw. so now with more fuel added back in it is making the 213rwkw. with fuel now in the 11's it is a lot safer especially when it is basically a track/thrash/drift car

this is the same boost setting aswell in both power runs. at 1BAR

the lightened flywheel seriously felt like it made a difference! as opposed to the stock flywheel it helps spin easier because it's lighter - meaning it helps revs build up quicker and boost. (well thats what i'm guessing lol)

there was a HUGE increase of torque in the MIDRANGE.

originally i was very disappointed with the turbo and was 99% sure was going to put a stock rb20 turbo back on. it was that bad! BUT now it is a lot better.

just thought i'd post it up as i know of at least 2 other guys with similar lag problems from a hks2530 and hks2510 on rb20's

[Simon-S14]

lag for 2530 maybe but 2510 on stock motor pffft they are LAG FREE unless you got serious issues with your timing

[nF]

so just beware the hks2530 on rb20det may not be exactly your choice in turbo upgrade and if upgrading i wouldnt mind seeing how a hi-flowed steel wheel rb25 turbo would be...

<{POST_SNAPBACK}>

made 190kw with a highflowed rb25 turbo on my rb20 at 14psi

little disappointed, but it was running on just actuator, no boost controller

lag is pretty huge, turbo starts spooling 2.8-3.0k but doesn't make fullboost till maybe 4.5k

Edited January 6, 2006 by nF

[huddy]

lag for 2530 maybe but 2510 on stock motor pffft they are LAG FREE unless you got serious issues with your timing

<{POST_SNAPBACK}>

yep well lindo 'was' having lag issues with his 2510... once again the 1BAR adj actuator did make a big difference for him aswell...

and that is very interesting about the rb25 turbo!!! thanks for the info

[nF]

considering theres no boost controller, the lag is probably worse than it should be

even so, i wouldn't expect anything exciting happening before 4.2k, and considering i want 17 or 18psi it'll be worse probably

[huddy]

another thing - check your actuator isnt dodgy (remove dump pipe and make sure wastegate is shut firm)

a dodgy way to increase your boost and also possibly reduce lag is to put a kink in your actuator rod (creates more tension) this may help if you're on a budget? or get a adj actuator rod...

[BHDave]

I've seen this problem a few times in the last couple of months and every time it is the actuator, either set too loose (when adjustable) or still running a stocker.

This is on cars running decent ebc's aswell.

As for the highflow on an rb20. I ran an old stage 2 GCG and had 14psi by about 41-4200rpm using only an hks adjustable actuator. The current highflows are a bit more responsive than those ones.

nF, you'll find the boost curve will be an almost vertical line once you start winding boost in on the highflow. It will slowly build up to about 6-8psi over 1000 rpm or so and then just shoot up to what ever you decide to run in the next 200 (big turbo/small engine type response). You probably wont be able to spot the difference in spool time unless you plot runs back to back on a dyno.

[Ceffy_SA]

Good to hear the Ceff is going alot better now Huddy, was alot of fun trying to tune your HKS EVC III around Pt Wakefield, had boost response like a light switch

You still running about 1.1BAR through the 2530?

Cant wait until to see it out on the track again some time soon

Gettn a new turbo for my Ceff tonight, RX7 S5 comp, high flowed RB20 turbine, i hope its not going to be too laggy...

[1400r]

u should put this in the forced section

see how many people you get saying bulsh*t

I remember being told I wouldnt get over 150 rwkw on a stock ecu lol

[huddy]

lol.... now that is pretty funny...

[A31Drifter]

Sh!t I have a HKS GT2540 going on my car next week. Had the turbo on my S15 SR20 made boost around 3800rpm. Dont see how an RB with two extra cylinders can lag more than a SR.

Can anyone aswer that????

[cefiro]

Hey A31drifter, the rb smaller capacity per cylinder, be a shorter stroke than the SR there for less mid range and harder to spin the turbo up. think thats correct in short anyway

I have a 2535 on my rb20, I dont find it a problem wouldnt get too worried its a little laggy but it slams it on.

Edited January 10, 2006 by cefiro

[A31Drifter]

Thanks cefiro just wondering what rpm did you hit peak boost

[cefiro]

peak boost close to 4k, when you get it on there with a tune let us know how you go. I think you will find it lagier on the RB but will love to rev more than the SR, but thats just the nature of the RB.

[Gts-t]

I've seen this problem a few times in the last couple of months and every time it is the actuator, either set too loose (when adjustable) or still running a stocker.

This is on cars running decent ebc's aswell.

As for the highflow on an rb20. I ran an old stage 2 GCG and had 14psi by about 41-4200rpm using only an hks adjustable actuator. The current highflows are a bit more responsive than those ones.

nF, you'll find the boost curve will be an almost vertical line once you start winding boost in on the highflow. It will slowly build up to about 6-8psi over 1000 rpm or so and then just shoot up to what ever you decide to run in the next 200 (big turbo/small engine type response). You probably wont be able to spot the difference in spool time unless you plot runs back to back on a dyno.

<{POST_SNAPBACK}>

I am running the stock actuator on my hks 2530, running 1.2 bar thru and ebc and have no issues at all. Infact i sold the hks adjustable that came with it becayse SK doesnt recomend the adjustable type.

[adrnln]

Ive put the VG 30 turbo BB on my rb20 Ceffy but had to replace the engine before i could dyno it. Has anyone done this turbo set up and what results did they get??

I'm also running GTR fuel pump, 3" exhaust all the way through, twin dump pipe and bleed valve set at 18psi, Blitz BOV and pod.

Engine goes in next week and I will send her off to the dyno for figures, Which i'll post up

[adrnln]

Ive put the VG 30 turbo BB on my rb20 Ceffy but had to replace the engine before i could dyno it. Has anyone done this turbo set up and what results did they get??

I'm also running GTR fuel pump, 3" exhaust all the way through, twin dump pipe and bleed valve set at 18psi, Blitz BOV and pod.

Engine goes in next week and I will send her off to the dyno for figures, Which i'll post up