RB25 problem that is driving me crazy!

Discuss the RB20, RB25 and RB26 series engines.
flaco S14 ka24det
Posts: 9
Joined: Mon Sep 05, 2005 10:30 am
Car: Nissan 240sx s14 ka24det

Post

ok i wanted to see if anybody has had any similiar problems, i swapped out my KA-T cuz i broke all four pistons i know have an rb25 upgraded but it litterally runs worse than stock. ok i swapped it in with a topmount garrett t3/t4 turbo, and front mount. I ran a few events but then my head gasket went out the time it was running i was only boosting around 7psi due to what i thought was a bad manual boost controller, The reason i knew the head gasket went out was because #5cylinder had water in it so i took everything apart and put in a cosworth hg new intake manifold gasket and exhaust gasket. it also has new greddy belt, waterpump, the sparkplugs i changed wen i first got the engine they are ngk platinums i believe. OK NOW THE PROBLEM i put everything together and it idles perfect i reseted teh SAFC and put the basic settings back to where they go i go to drive it and it doesnt want to go over 5psi and kinda sputters and hesitates and feels really laggy like it doesnt want to accept boost. it was running good before the hg and now it runs like crap, i tried running the wastegate straight to the turbo but it still hesitates and 5psi and i dont wanna push it and blow the engine. so plz if anybody has any suggestions let me know i wanted to have it running for tomorrow but i dont think its going to happen, thanks for the help in advance


sepulchralx
Posts: 203
Joined: Tue Aug 02, 2005 8:19 pm
Car: 240sx

Post

flaco S14 ka24det wrote:ok i wanted to see if anybody has had any similiar problems, i swapped out my KA-T cuz i broke all four pistons i know have an rb25 upgraded but it litterally runs worse than stock. ok i swapped it in with a topmount garrett t3/t4 turbo, and front mount. I ran a few events but then my head gasket went out the time it was running i was only boosting around 7psi due to what i thought was a bad manual boost controller, The reason i knew the head gasket went out was because #5cylinder had water in it so i took everything apart and put in a cosworth hg new intake manifold gasket and exhaust gasket. it also has new greddy belt, waterpump, the sparkplugs i changed wen i first got the engine they are ngk platinums i believe. OK NOW THE PROBLEM i put everything together and it idles perfect i reseted teh SAFC and put the basic settings back to where they go i go to drive it and it doesnt want to go over 5psi and kinda sputters and hesitates and feels really laggy like it doesnt want to accept boost. it was running good before the hg and now it runs like crap, i tried running the wastegate straight to the turbo but it still hesitates and 5psi and i dont wanna push it and blow the engine. so plz if anybody has any suggestions let me know i wanted to have it running for tomorrow but i dont think its going to happen, thanks for the help in advance
sdfsdfsdfsdfdssdfds

ever heard of spell check and bullets? take it to a shop because nobody will help you with a s*** post like that..


DrifterProdigy85
Posts: 1817
Joined: Sat Jul 02, 2005 7:42 pm
Car: 1989 Nissan 240sx (Zenki Onevia)

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It sounds like timing to me. Double check the timing with a timing light.

rb25det250sx
Posts: 443
Joined: Sat Feb 07, 2009 9:20 pm
Car: '96 Nissan 240SX RB25DET powered!!!
Contact:

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yeah, check timing. but also did you get both the head and the block planed, for the new HG?

flaco S14 ka24det
Posts: 9
Joined: Mon Sep 05, 2005 10:30 am
Car: Nissan 240sx s14 ka24det

Post

ok im sorry for the spelling and punctuation in my first post, i was just mad and frustrated. I finally found the problem i had two small boost leaks, I finally took it out to Inland Drift on Saturday and it ran awesome time to turn up the boost and get it tuned.


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