Officially The Rb25 Propane Build thread!!

[Carl H]

since you're running the MS setup have you plumbed in an air temp sensor?curious to see what your air temps are.also are you running a traditional intercooler in tandem with your 'charge box'?

[rb25drag]

Yup I do have a air intake temp sensor, I put it in the back of my intercooler piping right before the TB.I do not have any other type of intercooler except the propane cooler I made.We will know the results very soon. I hope to fire it up tom. I got a few more things to finish then its game on and tune time.

[TJcars2]

Looks sick. Updates?

[sepulchralx]

Do you own a gas well?

What is the heating value of propane?

You actually think that copper gasket stuff will hold up over time or is that temporary?

[BHFR-GTR]

if you run anything over 12 precision turbo recomends only using copper sealant because a gasket will allways blow out, i have used this on many turbos, make sure the flanges are straight and coat both sides ( the mani and turbo ) and when you start it just let it run for a few mins and not rev it, it will never leak awsome stuff

[sepulchralx]

if you run anything over 12 precision turbo recomends only using copper sealant because a gasket will allways blow out, i have used this on many turbos, make sure the flanges are straight and coat both sides ( the mani and turbo ) and when you start it just let it run for a few mins and not rev it, it will never leak awsome stuff

Wow, didn't think it worked that well.. I guess you dont want to use a whole lot of it though.

[rb25drag]

Ya like BHFR-GTR says, copper is the only way to go. Itss the best gasket you will ever have.As for the Propane heat, Its 91,500btu vs gas 116,000btu, Although it doess not burn as hot, it is detonation friendly. It allows for So much more tuning ability, I still did not get it to fire. Im running into a few wiring issue's.I had an Autometer oil temp gauge short out and take out my accessory selenoid, So im in the middle of re-wiring a fuse block and relays to run everything. I also am having a issue with my vr sensor. It seems to not wanna pick a signal up, I think the sensors's bad b/c I can hook my wiring up with an old sensor on the bench and I can get a signal.ButI hope to have it all finished bY friday. I am suppose to be on the dyno sat.

[sepulchralx]

Ya like BHFR-GTR says, copper is the only way to go. Itss the best gasket you will ever have.As for the Propane heat, Its 91,500btu vs gas 116,000btu, Although it doess not burn as hot, it is detonation friendly. It allows for So much more tuning ability, I still did not get it to fire. Im running into a few wiring issue's.I had an Autometer oil temp gauge short out and take out my accessory selenoid, So im in the middle of re-wiring a fuse block and relays to run everything. I also am having a issue with my vr sensor. It seems to not wanna pick a signal up, I think the sensors's bad b/c I can hook my wiring up with an old sensor on the bench and I can get a signal.ButI hope to have it all finished bY friday. I am suppose to be on the dyno sat.

Lol cars never come out on time like you want them to.. Good luck

[rb25drag]

Well today was pretty productive. I finally got the car started, After some preping and

[rb25drag]

Well today was pretty productive. I finally got the car started, After some preping and tweaking on the spark map I made my trip to the dyno.car Sounds AMAZING. I was surprised.But The guys at the dyno had a Hard time picking up a tach signal so I didnt get any good numbeers

[Seishuku]

That's pretty cool, not many people do this kind of thing.

Personally, I was going to do a full port liquid propane injection setup on my SR, but I still haven't found anyone that sells the injectors outside of the UK.Very frustrating.

I would go with a carb, but they're an eye sore and I don't like the operation that much. It does work well however!

Gotta love non fouling fuels though, that's nice isn't it? Longer oil life, clean emissions, and high octane!

What tank are you using?

[rb25drag]

Well I Finally got it running on the new setup yesterday, Got the megasquirt all worked out and The new turbo workes great with my adapter flange I made with the ext wastegate for the stock manifold.

I got some Dyno time also.

The Dyno kept loosing connection so I never got any accurate numbers.

My intercooler we made had a internal fuel leak So Everytime I hit boost It was going SO rich. 9.4 A/F I also was only doing 6000rpm pulls. We went to 10lbs of boost and decided to stop until I fix the intercooler.

The Manifold air temps was staying in the 105-110 degree range, It was 90 degree's outside here also.

I got a few problems to fix But even running so Rich The setup run really Smooth. It idles like a dream and goes threw the gears really nice also.

I got some video's ill try to get posted Tommorrow.

[Darius]

I love this project! Keep it up!

[mcfly]

Keep an eye on that front crank pulley, I can see where the rubber is cracking. Don't want that to seperate!

Thats asking for a cracked block, replace it.

[rb25drag]

Here is the Video of the dyno

http://www.youtube.com/watch?v..._page

[pepegurr]

Nice job man , now hurry up and fix that leak so we can see what that thing really does.

[rb25drag]

we set down last night and discussed a new design intercooler. That intercooler we made obviously worked. Considering it wass 90 degree's outside and our air temps were 108, But it still is not as good as we want it. So im going to design a new intercooler combining a water and propane combo. SO the car will be down for a couple weeks while I make a new intercooler.We also want to seperate the fuel from having any chances of getting into the intercooler like it did last time if it has a leak. I got a good design in my head. Now I just gotta fab it up.

[nelson8708]

cool vid....your car had a loud cough there at the beginning

[Darius]

Thats asking for a cracked block, replace it.

A busted balancer pulley will not crack a block. The drive to the pulley runs on the same key on the crank that the timing belt runs on. Worst thing that could happen is the pulley could go flying all over the place.

[SullivanRacing06]

i had a few cracks on the front part of the crank pulley on the first 20 i had. was using the stock gtr pulley for a good amount of time on the current 26, then switched to a ati 600hp+ unit, glad i did, where the key way goes into the pulley it have a good 1mm crack that wen t all the way into the rubber part, not good

nice pull btw, a lil cough in the beginning but sounds strong! numbers?

[240z4u]

A busted balancer pulley will not crack a block. The drive to the pulley runs on the same key on the crank that the timing belt runs on. Worst thing that could happen is the pulley could go flying all over the place.

Yeah, no big deal

Ill be honest, I was very skeptical that you would ever get this done due to your halfass ways with the f/i system. I am glad to see your making progress.

I have a request... an external hookup for a grill. You could easily have the best tailgate track car evar!

[rb25drag]

Thanks guys, Actually I have already beat u on the Grill Idea ha ha, Its already in the fab stage lol.The numbers off the dyno were not accurate, the dyno kept loosing connection to my car. That run there it showed 321tq and 107hp lol So idk exactly what it was pushin. But It didnt matter. The car was crazy rich, so I will know more in a few weeks when I go back.As far as that pulley everyone keeps complaining about, Its fine the way it is. Its staying.

[rb25drag]

Well I got to street drive it a little today, I have to say the turbo does not spool up to fast in 2nd gear from a slow roll, But When it comes on Its crazy on just 8psi!!

I Still have a backfire issue between shifts, I am going to put a muffler on it this week and Im also going to re-do my intercooler piping so my BOV is closer to my intake, As it stands its about 4ft away.

I hope adding the muffler adds some back pressure and cures the backfires, Its really F-ing loud

I also drove it without a intercooler, Its just straight piped until I get my new one built. I only went around the block.

I did figure out my propane carb has a WOT fuel adjustment So after I get all my other crap in order I will adjust on that to lean it out. But its parked as of now until I get the backfires cured. Dont wanna blow anything else.

[rb25drag]

Well its been a few weeks and I have gotten alot done. Finally got an exhaust. Single flow race Flowmaster. Have to say it has a really nice DEEP tone. Its still pretty loud ESP up top.

I got my Backfire issue figured out also. No more Bangs on shifts lol.

I am working on the all Aluminum IC piping at the moment. Also am Temperarly adding a Borrowed FMIC to get some Dyno time and see how my intake temps compair.

Im gonna get some more Dyno time next weekend with all the new parts. So hopefully will be seeing alot more boost. Maybe in the 20lb range if All goes as planned. I am only stepping it up a little at a time so I get a good tune range.

Overall the Motor is running Better than ever before. its so smooth compaired to the past.

[mattblancarte]

I have been waiting so long to see some legit numbers... stop teasing me!

[wrxratd]

I have been waiting so long to see some legit numbers... stop teasing me!

+ eleventeen!!

[rb25drag]

Ha Ha sorry for all the teasing guys. Im as curious as u guys. Im the only one fabricating so its kinda a slow process.I did finish all the Ic piping last night and got some street time. It runs great. Now my only problem is I need to lean it out. I cant seem to get it out of the 9.0 a/f readings at part to full throttle. But after it buildss enough boost to lean it out into the 10's a/f holy s*** it comes to life!!Ii got a few more Idea's were gonna try. so just hang tight

[wrxratd]

So what is your target afr supposed to be with propane? 10:1 just sounds really really rich still!!! Glad to hear it's coming together though!!

[rb25drag]

Well my ideal a/f is around 12-12.5 wot. Propane you can run leaner than gas. But I dont know how far I wanna push it lol. If I could get it into the 11's I could add some more boost and get it leaned. But wot is not really my major problem. Its the part to half throttle thats killing it. It dont have no mid range power due to being so rich.

[Sil240]

Awesome build!!!!Def not your run of the mill swap/build.

What did you do about the injector holes in the ITM?

You should def look into how much pressure a water to air IC would hold?

Have you mastered the Black Art of Carb tuning yet? I saw somewhere on the net a nice write up and pics to help.Don't know if this would apply to your Propane Carb though.

What you should do also when you get it running perfectly is, take it to a gas station and have them run it through the emissions test. Just to see how clean that thing is.