B20VTEC Dyno

[Vteckidd]

This is a guys B20VTEC we dynoed last night. its a very mild setup and it made awesome power.

B20 Block
CP 9.7:1 pistons
Eagle Rods

GSR head shaved .015
Skunk2 Valves
Skunk2 Springs and Retainers
Skunk2 Pro1s
Skunk2 Pro Series Intake Manifold
DC JDM 4-1 header

Scotty Tuned with Uberdata. Final compression we guessed was around 10:1

http://www.we-todd-did-racing.com/wetoddimage.wtdr/wMTEwMjY1NzZzNDEzZGZkMzF5NTQx.jpg

Low compression is cause its a Nitrous motor

[99SI]

pretty good. What was the tune with? Uberdata? That's very good for having the DC and no headwork.

[DrivenMind]

Remeber we had that enormous Vtec vs Anti-vtec discussion a while back because my buddy had that B20 Integra and was blowing cash on useless shit LS parts to make a grand total of 140 something whp, while I was suggesting he get a B16 or B18C head? He swore up and down that vtec was bullshit and he didn't need it to make his Integra quick, and that'd he'd "walk GS-Rs all day long" or something to that affect

Well it seems that swap is making killer power and he should have just fucking listened to me from the get go instead of blowing cash on his low compression, low power LS bullshit.

sorry for the rant. just looking at this dyno reminded me of that occasion and he pissed and moaned about how I was a "no nothing" and what not, while it appears the vast majority of the hondas take full advantage of having dear old vtec.

[Supacharge]

low compression isnt for all motor anyhow. your friend doesnt sound smart. good #s

[speedminded]

nice gain at 5,500. The head or IM hasn't been ported at all yet? I'd almost bet you could get another 15hp or so with it...i think we were getting 205/145 with a b16 head and all skunk2 internals on a stock b20z block.

[Vteckidd]

low compression isnt for all motor anyhow. your friend doesnt sound smart. good #s
READ, it is a NITROUS motor, hence the low compression. Head has been mildly ported, but no one knows the CFMs , so i think it was prob just cleaned.

[99SI]

^^^ I think he was making reference to Estis' friend with the low compression all motor non vtec, not this engine.

[Vteckidd]

oh, then i retract my previous statement.

[A.P. Photography]

What shot is he going to run on it? Have you dynoed it with it on the bottle yet?

[Vteckidd]

200 shot direct port wet kit.

we have not done the bottle yet, that will be in a few weeks

[A.P. Photography]

Cool, can't wait to see what it does on the bottle. Good job :goodjob:

[GTScoob]

What kinda car is this in? Sounds like a beast after nitrous. How much whp should a 200HP shot equate to? 150?

[99SI]

It should probably be close to that. 140-160 I would say.

[Vteckidd]

direct port, should make 380whp and 350TQ. its in an EG hatch

[93H22ACX]

just wondering why didnt he go with high compression nitrous pistons?

Higher compression and nitrous makes a good combination....

looks good though.. .cant wait to see it in action :goodjob:

[Vteckidd]

i didnt build the motor, we just tuned it.

i have no idea why he chose those pistons, i think he was going to go turbo at first then changed his mind

[jackdaripper]

just wondering why didnt he go with high compression nitrous pistons?

Higher compression and nitrous makes a good combination....

looks good though.. .cant wait to see it in action :goodjob:
Well you see with high compression pistons you are limited to how big of a shot you can use, however with the low compression the sky is the limit. The head has a good port job just at high rpms it falls off due to no compression to combust all that is coming in, now when the car is sprayed it will wake up and a "200 shot" would actualy probbly put 210-220 to the wheels extra. Also it won't be a 200 shot on the car, but it WILL dominate on the street.

[93H22ACX]

Well you see with high compression pistons you are limited to how big of a shot you can use, however with the low compression the sky is the limit. The head has a good port job just at high rpms it falls off due to no compression to combust all that is coming in, now when the car is sprayed it will wake up and a "200 shot" would actualy probbly put 210-220 to the wheels extra. Also it won't be a 200 shot on the car, but it WILL dominate on the street.

actually you're wrong there. With tuning, sky is the limit. Higher compression with the same 200 shot of nitrous makes more whp than a lower compression pistion with 200 shot of nitrous.

Same as higher compression and turbo, it allows faster spool and more power per psi...most of the time if its built right

[Vteckidd]

there are 2 schools of thought on this subject.

A long time ago people went with as low compression as possible for their FI motors. But, nowadays there is info to prove otherwise.

You can make the SAME WHEELHORSEPOWER with less boost if you run more compression. so at 8,5:1 compression youll need 35 psi to make 600whp. or at 10.1:1 you only need 25psi to make 600whp (assuming turbo setup is the same). which is more efficient? i would take the 10:1 motor.

Nitrous has a cooling effect. On a higher compression motor, you can run less of a Nitrous shot and make the same power. Or, cause of Nitrous cooling effects, you can run a 200shot on a 12:1 motor, AS LONG AS ITS TUNED RIGHT. timing and fuel are critical.

I knew a guy once that had this 11.7:1 motor, he sprayed a 125shot on his engine. it lasted and never blew up, he ran a 12.1

:)

[93H22ACX]

there are 2 schools of thought on this subject.

A long time ago people went with as low compression as possible for their FI motors. But, nowadays there is info to prove otherwise.

You can make the SAME WHEELHORSEPOWER with less boost if you run more compression. so at 8,5:1 compression youll need 35 psi to make 600whp. or at 10.1:1 you only need 25psi to make 600whp (assuming turbo setup is the same). which is more efficient? i would take the 10:1 motor.

Nitrous has a cooling effect. On a higher compression motor, you can run less of a Nitrous shot and make the same power. Or, cause of Nitrous cooling effects, you can run a 200shot on a 12:1 motor, AS LONG AS ITS TUNED RIGHT. timing and fuel are critical.

I knew a guy once that had this 11.7:1 motor, he sprayed a 125shot on his engine. it lasted and never blew up, he ran a 12.1

:)

well said LOL...

Example also...
GSR hatch, stock 10:1 running 100shot = 12.01@112MPH
H22 hatch, 11.8:1 running 70 shot= 12.1@115MPH

[jackdaripper]

Thats all cool on a "race car" But this is a street car, and its about 10.3 to one, didnt want to radical set up for unreliablity. This car will last for ever on a 2 stage set up with a 200 shot. But what do I know Ive only had nitrous on about 40 of my cars.

[Vteckidd]

is this shane?

[93H22ACX]

our two cars were not race cars at the time...it was driven daily.

the h22 with 11.8 cr was driven from lilburn to alpharetta everyday so thats an average of ummmm 1+ hours of commute one way. The gsr hatch was driven from commerce to winder everyday. also some stock honda / acura motors are 11:1...11:1-12:1 is fine on the street if its tuned...

all im saying is that higher compression makes more power off and on nitrous, turbo, or naturally aspriated. Thats why nitrous pistons are 11:1 cr or more....

theres no need to bring in how many cars you ran nitrous on...we can say we've done more than that but what would that prove?

its just one's opinion...and its been proven that higher compression with anything yields better resutls..

no engine will last forever... no matter how well built it is... especially with a 200shot of nitrous.

[jackdaripper]

is this shane?
Yes it is, also when selecting the pistons they had in stock either what we have or 12.5:1, the guy didnt want to wait for custom built pistons, so we will make it up with nitrous. Of course no motors last forever, however a 10.3ish:1 motor will alot of nitrous will last a hell of alot longer then a 12 to 1motor under the same circumstances. Like I said its a street car, not a race car, we want it to "work" on the street, to much powa and it wont work.