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Rb25det 280z, New Dyno #'s....595 Rwhp

J Taylor

By J Taylor,
in Engines & Forced Induction

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J Taylor Newbie

J Taylor

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Put my Z back on the dyno last night to see what kind of numbers it would make since installing the nitrous. The pull was made on 93 octane fuel, 17 degrees total timing, 11.2:1 AFR. Laid down 595 rwhp (~444 kw). Still on completely stock long block down to the stock headgasket and cams. Keep in mind this is also going through a th350 transmission, which cost me about 40 or so rwhp when I changed from the 5 spd. Anxious to get it back to the track now.....I figure it oughta trap in the 140 range and get in the 9's with some decent traction.

JT

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J Taylor Newbie

J Taylor

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Off the bottle it made 445 rwhp 11.8:1 AFR. On a "50" shot it made 515 at like 10.5:1 afr. On the "90" jets it only made 535 but was below 10:1 for the entire pull. Obviously they jet them VERY conservatively. I ended up using the 125 nitrous jet and kept the 90 fuel jet which put me a 11:2 and 595 rwhp. And actually on that pull I had a nitrous leak. After fixing the leak, on the next pull, it was making another 35 hp at 6000 which put it on the track to be about a 630 hp pull. I didn't get to complete it though b/c of a nice backfire. I have been having this backfire problem for the past couple weeks intermittantly. It's something to do with the SDS since it does it on motor as well. It's throwing an rpm error message when it happens. I am off work tomorrow and hopefully will be able to run down the problem and head over to the track. For some reason I have a feeling the 235-60-15 M/T ET street radials aren't going to like the gas too much. LOL. We'll see.

JT

32DET Enthusiast

32DET

Posted
Posted

I am not sure about america but genuine 280z's are very rare in australia...most are just rebadged 240/60's with l28's in them! Are they more common in america? I used to have a 240 but gave it up for a skyline...one day i will get one back though...untimate car in my opinion.

Very nice car by the way mate!

gtst25 Proficient

gtst25

Posted
Posted
Off the bottle it made 445 rwhp 11.8:1 AFR. On a "50" shot it made 515 at like 10.5:1 afr. On the "90" jets it only made 535 but was below 10:1 for the entire pull. Obviously they jet them VERY conservatively. I ended up using the 125 nitrous jet and kept the 90 fuel jet which put me a 11:2 and 595 rwhp. And actually on that pull I had a nitrous leak. After fixing the leak, on the next pull, it was making another 35 hp at 6000 which put it on the track to be about a 630 hp pull. I didn't get to complete it though b/c of a nice backfire. I have been having this backfire problem for the past couple weeks intermittantly. It's something to do with the SDS since it does it on motor as well. It's throwing an rpm error message when it happens. I am off work tomorrow and hopefully will be able to run down the problem and head over to the track. For some reason I have a feeling the 235-60-15 M/T ET street radials aren't going to like the gas too much. LOL. We'll see.

JT

It must be a handfull to drive!

Just wondering what nitrus set up you are running? Is it ecu or computer controlled?

Cheers

gtst25 Proficient

gtst25

Posted
Posted
Off the bottle it made 445 rwhp 11.8:1 AFR. On a "50" shot it made 515 at like 10.5:1 afr. On the "90" jets it only made 535 but was below 10:1 for the entire pull. Obviously they jet them VERY conservatively. I ended up using the 125 nitrous jet and kept the 90 fuel jet which put me a 11:2 and 595 rwhp. And actually on that pull I had a nitrous leak. After fixing the leak, on the next pull, it was making another 35 hp at 6000 which put it on the track to be about a 630 hp pull. I didn't get to complete it though b/c of a nice backfire. I have been having this backfire problem for the past couple weeks intermittantly. It's something to do with the SDS since it does it on motor as well. It's throwing an rpm error message when it happens. I am off work tomorrow and hopefully will be able to run down the problem and head over to the track. For some reason I have a feeling the 235-60-15 M/T ET street radials aren't going to like the gas too much. LOL. We'll see.

JT

It must be a handfull to drive!

Just wondering what nitrus set up you are running? Is it ecu or computer controlled?

Cheers

32DET Enthusiast

32DET

Posted
Posted

thats a shame, 240 body is much nicer

Are you sure you arent confusing it with the 280ZX as the difference between a 240 a 260 2 seater and a 280 are very very minimal. Just small things like the badge on the pillar, grille on rear hatch etc. Shape is the same.

rbs30 Collaborator

rbs30

Posted
Posted

240z,260z(except the 2+2) and 280z are all exactly the same body(different bumpers etc)..we did not get the 280z here is aus..we only got the 280zx which is down right ugly in my opinion..JT,we meet again!lol its its rbs30 from hybridz (rb30det 240z)

MR331307 Experienced

MR331307

Posted
Posted (edited)
Off the bottle it made 445 rwhp 11.8:1 AFR. On a "50" shot it made 515 at like 10.5:1 afr. On the "90" jets it only made 535 but was below 10:1 for the entire pull. Obviously they jet them VERY conservatively. I ended up using the 125 nitrous jet and kept the 90 fuel jet which put me a 11:2 and 595 rwhp. And actually on that pull I had a nitrous leak. After fixing the leak, on the next pull, it was making another 35 hp at 6000 which put it on the track to be about a 630 hp pull. I didn't get to complete it though b/c of a nice backfire. I have been having this backfire problem for the past couple weeks intermittantly. It's something to do with the SDS since it does it on motor as well. It's throwing an rpm error message when it happens. I am off work tomorrow and hopefully will be able to run down the problem and head over to the track. For some reason I have a feeling the 235-60-15 M/T ET street radials aren't going to like the gas too much. LOL. We'll see.

JT

Im glad someone else has made serious power out of a Rb25det motor

i made 591 rwhp(dyno dynamics dyno) out of a stock rb25 but it was manual in an r33

best run i had was when the car was making 540 rwhp and i run a 10.8 @129 mph with slow gear changes and backing off the accelerator at the 1100 foot area or so cause the car got crossed up

then i bent a rod which was number 6 then i gave up and went to the package im running now

the standard motor lasted me around 7-8 months of hard work and over 350 dyno passes

i used the 255/60/15 and best i ran was 11.3 @128

i used 10.5/26/15 MT slicks and went 10.8 @129 but at the 660 mark i was doing 110 mph from what i remember

Edited by MR331307
J Taylor Newbie

J Taylor

Posted
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GTS25: It's just a plain ole NX Nitrous Kit. No computer control or anything.

RBS30: Whats up man? Long time now see. LOL.

The pulls were made on a dynojet which I know typically reads a little higher than some other dynos but when you plug my numbers into a hp formula that takes your 1/4 mile ET, speed, cars weight, and everything it comes out pretty much dead on.

JT

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