Anyone been on a dyno?

Post by **JonPowell** » Thu Oct 23, 2003 5:37 am

I am just curious, if you have dyno'ed your RB if you could tell us your results & the setup to achieve those results.

For some reason I dont think my RB25DET is at its peak and will be attempting to run it on a dyno some time early spring (The car needs to be put away soon, snow is coming).

Thanks,Jon

Post by **hashiriya13** » Thu Oct 23, 2003 5:37 am

Changing some parts soon and then to the dyno for tuning. should be soon got almost all the parts. I will post when its done. Looking for 400 but we will see.

Post by **Imissmyturbo** » Thu Oct 23, 2003 5:37 am

Here are some skyline Dyno's with I/E/Boost+

http://www.skylinesaustralia.c...27780

FYI 146 KW = 195 HP

As you can see the A/F ratio's are pretty low up top so you can see what alittle AFC tunning will do for a stock RB25

Post by **D-UNIT** » Thu Oct 23, 2003 5:37 am

That's weird. I thought the RB could put down way more power than that stock w/ upgrades !?! Cuz my friend has a stock corrado engine (vr6) in his vert VW. He puts down 191.6rwkw (257hp)@4000rpm at only 8 psi. I really want an RB25 badly , but is it going to be that weak (no offence)? I just don't want him to beat on me. Plus all he needs is injectors and a HG , and he'll be in 15psi land = 390+ hp ( 290.8+kw). What will I need to do to smoke his a$$!! I'm scared!! btw.. that was a fourth gear pull. He was hitting 150hp@2000rpm.

Post by **Imissmyturbo** » Thu Oct 23, 2003 5:37 am

Build your KA (if thats what you have) With upgraded Pistons and stock rods you will have no problems making 350-400 whp with the right turbo + fuel suport. I know what you mean about that being weak. It's nice to have access to an Aussi board so we can kill all the lies about RB's putting more then 250 to the wheels stock.

Post by **JonPowell** » Thu Oct 23, 2003 5:37 am

I have been using the G-Tech and doing runs in 2nd and 3rd gear, The highest result so far was 225HP with ****ty tires and tons of wheelspin. I am not too sure how reliable that thing is so I wanted to check.

I have 3" cat back Bli8tz realize TT exhaust (for the ECR33) and Blitz LM air filter. Everything else is stock.

Last night I tried and got 216 and 219 HP in 2nd gear.

Again wheelspina nd not sure how reliable.

Post by **kevy8up** » Thu Oct 23, 2003 5:37 am

Ok guys.....Im not hijacking but I gotta ask this. if those charts are true could i just get a ca18det and put about a $1000 of mods on it and prolly get the same as and RB25 stock IF not better??

Post by **D-UNIT** » Thu Oct 23, 2003 5:37 am

I was totally in to building my KA , but when I added up all I wanted to do , it comes out more than an RB swap. Turbo-$1200 , fuel upgrade $1000 , fmic $600 , misc turbo goodies (bov , wg , rrfpr , etc) $1000 , pistons rods $1000 , machine work $1000 . I'm just worried that after I do all that , my motor is still going to pop. So now I want an RB. That's is real weird cuz I could get a $3700 greddy turbo kit (more than RB front clip) But it puts out 220hp to the wheels. I thought that was weak ( non intercooled , 6 psi ) but now I realize that is pretty good. WTF--for the money KA>RB???????

Post by **JonPowell** » Thu Oct 23, 2003 5:37 am

Think of the starting point of these motors, why would you compare one lotor with $1000 in mods to a stock motor??? Dollar for dollar you will have probably the same power, but much less potential in the CA18, I dont knock the CA, but come on now......This is a pointless comparison. Could I get the same amount of juice out of an apple with $1000 in mods as a stock orange, who cares....Choose what motor you like.

Post by **D-UNIT** » Thu Oct 23, 2003 5:37 am

What are you talking about?

Post by **D-UNIT** » Thu Oct 23, 2003 5:37 am

Ohhh... I'm on it now. lol. sorry

Post by **kevy8up** » Thu Oct 23, 2003 5:37 am

forgive me for pissin u off Jon but i had to ask......anyway...after seeing what the ca18det stock lays down ....I dont think I wanna start with anything less than RB20.

Post by **JonPowell** » Thu Oct 23, 2003 5:37 am

I'm not pissed, but everyone asks that question, why buy a motor, build it up so you are closer to the limit and compare it to a motor at the low end of its potential. The CA18 had and still has its place, but you cant compare it to an RB. its like comparing a built B16 to an NSX motor, which has more potential and which would you prefer to have.....Thats all I am saying, dont compare stock to built, It's not fair.

Website · Post by **s13sr20chris** » Thu Oct 23, 2003 5:37 am

D-UNIT wrote:That's weird. I thought the RB could put down way more power than that stock w/ upgrades !?! Cuz my friend has a stock corrado engine (vr6) in his vert VW. He puts down 191.6rwkw (257hp)@4000rpm at only 8 psi. I really want an RB25 badly , but is it going to be that weak (no offence)? I just don't want him to beat on me. Plus all he needs is injectors and a HG , and he'll be in 15psi land = 390+ hp ( 290.8+kw). What will I need to do to smoke his a$$!! I'm scared!! btw.. that was a fourth gear pull. He was hitting 150hp@2000rpm.

remember you have fewer drivetrain losses in a fwd layout and dyno variation is worth like 2%.

Post by **D-UNIT** » Thu Oct 23, 2003 5:37 am

also the fact that he has 10:1 compression ratio and a 2.8L vr engine. I also must point out he hit 185whp NA w/ cams! I'm dead.

Post by **Nameless EJ6** » Thu Oct 23, 2003 5:37 am

It's a very easy decision when you consider how underpowered RB engines are. (hp per liter wise) Compare it to a CA18DET:

(Just using stock rating specs here)

RB25DET = 100hp/literCA18DET = 96hp/liter

Ok, so - lets say the CA18DET was to be a 250hp engine. It would need to put out about 138hp/liter to match that. That's alot of pressure for a small 1.8 liter engine...

So is it worth it to you?

Well.. now lets modify the RB engine a bit. Lets make it give out 138hp/liter like your CA18DET gives off with those mods you would put on it.

That would make the RB25DET about 345 hp. Realistically it would be quite a bit less.. but ALOT more powerfull than your *almost* maxed out CA18DET.

My point: The STOCK RB25DET is more reliable, bigger, and stronger than a CA18DET giving out 250 rated horsepower.

I always reason like this with numbers... because it makes it easy to understand. They're not super acurate numbers like I said, but you get the point.

CA18DET = stock underpowered 1.8 liter poop.RB25DET = stock underpowered AND as powerfull as your modded CA18DET.

You decide! You want to modify the 6 cylinder and make serious power? Or modify that puny 4 cylinder and try to catch up with the RB25DET?

Post by **JonPowell** » Thu Oct 23, 2003 5:37 am

That is exactly what I was trying to say, you just said it better.

Post by **dreamsOfSkylines** » Thu Oct 23, 2003 5:37 am

I have also read several times on SkylinesDownunder that the Aussie dynos read consistently and significantly lower than ones in the US. I have no clue why but its something to keep in mind.

I'm not sure why you think the Rb is weak, that corrado engine has higher compression, more dispacement, the same boost, and slightly less horsepower. Also the VW must have some kind of AFC right?

Website · Post by **s13sr20chris** » Thu Oct 23, 2003 5:37 am

...and nissan rules. cant say the same about vw.

Post by **D-UNIT** » Thu Oct 23, 2003 5:37 am

dreamsOfSkylines wrote:I have also read several times on SkylinesDownunder that the Aussie dynos read consistently and significantly lower than ones in the US. I have no clue why but its something to keep in mind.[b/]

I never thought they were weak till I read this thread. Thanks for the reassurance.
No afc. He hits 257whp@ 4000rpms @ 8 psi. He is actully leaning out at 4000rpms ( power falls flat ) If he gets injectors , he'll probably hit 300whp+ @ 7600rpms @ 8 psi. And he runs a consteint 13.7@104mph quarter mile time on 80 dollar KUMHOs. Thats in full show trim check it out it's nice.

http://www.8vturbo.com/totm/jantotm03.asp 13.7's exactly like this!!

I don't really "like Vduds but I love driving that one.I really want an RB but what you guys are saying is that its going to take a lot a hit 300whp. That all , I'm sure not going to put a VR6 in my car. HAHA. I'll just keep my options open.lol.

Post by **dreamsOfSkylines** » Thu Oct 23, 2003 5:37 am

That car has camshafts, fmic, and more, definately not stock. 8 psi is close to the limit on boost with with 10:1 compression ratio, and just dropping the compression with a headgasket can actually lead to worse detonation (due to the increase in quench area). With a RB25 with turbo and afc you can get 300+ rwhp easy. Look at this

http://www.skylinesaustralia.c...27361

Post by **D-UNIT** » Thu Oct 23, 2003 5:37 am

YES!! . that is exactly what I wanted to see!! anymore like that.

I never said he was stock though. I just wanted to know if I needed all those goodies to beat his a$$ on the dyno!!

Post by **dreamsOfSkylines** » Thu Oct 23, 2003 5:37 am

That is kinda the extreme case, he is totally maxxing out his injectors at that kind of output.

Post by **D-UNIT** » Thu Oct 23, 2003 5:37 am

I hate small injectors. They are the death of turbos. Hey Dream I'm going to start a new thread could you please post on it.

Post by **apex_7** » Thu Oct 23, 2003 5:37 am

I've got an RB20. I dynoed at 203hp and 207tq w/ a mbc, fmic, safc, 3" exhaust and 103 degree weather. I'm certain my IC was heat soaked b/c I had to drive 40 miles to the nearest dyno and got right on when I got there. I made that power while staying at about 12.5:1 af curve. The night after the dyno session, I made a 13.9 pass. Then my clutch went out, and I haven't had time to fix it since.

Post by **JonPowell** » Thu Oct 23, 2003 5:37 am

How much boost were you running?

Website · Post by **s13sr20chris** » Thu Oct 23, 2003 5:37 am

yeah, im curious to know how you set your mbc.

Post by **apex_7** » Thu Oct 23, 2003 5:37 am

about 14psi in 3rd gear.

Post by **kevy8up** » Thu Oct 23, 2003 5:37 am

rb20 and running 14psi and only 203hp. sheesh....is that a lil low? are u running stock intercooler?

Post by **kevy8up** » Thu Oct 23, 2003 5:37 am

nope he has a FMIC....weird

Anyone been on a dyno?

Anyone been on a dyno?

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