Results 1 to 10 of 10
Like Tree1Likes
  • 1 Post By 35th-ANV-SS

C5 rear mount turbo question?

This is a discussion on C5 rear mount turbo question? within the Forced Induction forums, part of the LSx Technical Help Section category; C5 rear mount turbo question? I have a 1998 C5 corvette with 232/234-112 lsa futral f14 camshaft,low lift..I believe 585 ...

  1. #1
    Junior Member
    Join Date
    Jan 2012
    Location
    copperas cove,tx.
    Posts
    9

    C5 rear mount turbo question?

    C5 rear mount turbo question?
    I have a 1998 C5 corvette with 232/234-112 lsa futral f14 camshaft,low lift..I believe 585 lift on each side.The car is 4l60 with Circle D 3600 stall and 3.90 geared.I recently added a rear mount 76mm turbocharger with intercooler.I am using stock manifolds with vbands welded on and entire turbo build is fabricated.My heads are stock and unmolested.I believe 806 castings but do have the valvetrain upgraded with dual springs,etc.Intake is a stock ls1 and TB is a bbk 85mm with spacer..My question is..Will I be able to achieve over 550 rwhp with this combo and rev it to 6k even with the positive overlap of the camshaft?My car is at the tuners at the moment..The car is dropping off drastically on power @ 5k rpm at only 5lbs of boost.The fueling,afr, and pressures are ideal as my tuner tells me.Any and all info is appreciated.I just want my car to at least rev to 5700 before dropping off.I believe the cam is rated for 6500 rpm.Its being tuned on E85 and has walbro 450lph e85 pump with hotwire and siemens deka 80lb high impedence injectors.Thanks guys

  2. #2
    Junior Member
    Join Date
    Jan 2012
    Location
    copperas cove,tx.
    Posts
    9
    Nobody?Really?

  3. #3
    Senior Member FasstChevys's Avatar
    Join Date
    Oct 2005
    Location
    Minnesota
    Posts
    3,315

    White
    '10 ZR1

    Honestly, I think 550 to the wheels is a stretch @ 5 psi. Especially if you haven't done anything to the heads. I'm surprised you're only achieving 5 pounds of boost with being intercooled. Something doesn't jive.

    I'm also curious why you care about what the engine will rev to. What are you trying to accomplish with the car?
    Last edited by FasstChevys; 12-18-2015 at 09:04 AM.

  4. #4
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,465

    Red
    02 35th LE Camaro SS

    I'm reading his post as the car only makes 5psi, not that he was expecting to only achieve that. I could be wrong.
    It's on jackstands.

  5. #5
    Member RONS98TA's Avatar
    Join Date
    Jan 2009
    Location
    MARYLAND
    Age
    44
    Posts
    803

    BLACK
    1998 PONTIAC TA

    Sounds to me the car should be able to make 500+ hp with no problem. If you are only seeing 5psi of boost, the you must have a clamp or 2 loose somewhere, causing a boost leak. Recheck all your clamps or you might even want to go as far as doing a boost leak check. Use an air compressor and a gauge and check how much boost the cold air intake tubing can handle. I would guess you should be able to make at least 15lbs of boost with that setup.
    1998 Pontiac TA, stock heads, FAST 90, FAST 90 TB, FLP LT, off road y-pipe with cat delete, flow master muffler, comp cams 54-457-11 223/231-610/617-112 LSA, Pro charger D1SC with FMIC @ 8psi, FROST tune, VIG 3200 stall, built 4l60e, snow meth kit, MOSER 12 bolt 373 gears, Derale 13900 trans cooler.

  6. #6
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,511

    Navy Blue Metallic
    98 T/A w/a little mods...

    Correct spring for the blow off valve?

  7. #7
    Senior Member FasstChevys's Avatar
    Join Date
    Oct 2005
    Location
    Minnesota
    Posts
    3,315

    White
    '10 ZR1

    Quote Originally Posted by 35th-ANV-SS View Post
    I'm reading his post as the car only makes 5psi, not that he was expecting to only achieve that. I could be wrong.
    You're right, I didn't read it correctly. At the same time, there's a lot more answers to questions needed on this one.


    '89 Turbo Trans Am Pace Car (Mom's car now)

    '68 Camaro - 572 coming soon

    '67 Nova - 406 SBC, PG

    '10 ZR1

  8. #8
    Senior Member FasstChevys's Avatar
    Join Date
    Oct 2005
    Location
    Minnesota
    Posts
    3,315

    White
    '10 ZR1

    Quote Originally Posted by RONS98TA View Post
    Sounds to me the car should be able to make 500+ hp with no problem. If you are only seeing 5psi of boost, the you must have a clamp or 2 loose somewhere, causing a boost leak. Recheck all your clamps or you might even want to go as far as doing a boost leak check. Use an air compressor and a gauge and check how much boost the cold air intake tubing can handle. I would guess you should be able to make at least 15lbs of boost with that setup.
    That 76 should take him way past 500 to the wheels. There's definitely issues. With no work done to the heads, the boost should go through the roof with that 76.

  9. #9
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,465

    Red
    02 35th LE Camaro SS

    That's my guess...a leak somewhere.

  10. #10
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,465

    Red
    02 35th LE Camaro SS

    Unless the car is making more than 5psi, but isn't making the power. Then that's another story. OP doesn't really say what max boost/power was.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Question: C5 rear mount turbo question?
    By rthackwray in forum Nitrous
    Replies: 0
    Last Post: 12-17-2015, 12:52 AM
  2. Done with the Rear Mount Turbo!
    By cailey37 in forum Forced Induction
    Replies: 23
    Last Post: 09-07-2011, 10:40 AM
  3. Wanted: sts rear mount turbo 99 camaro ss
    By 99SNAKESKINNER in forum Parts Wanted / Trade
    Replies: 0
    Last Post: 11-04-2009, 07:39 AM
  4. Rear Mount Turbo
    By Txyoungguns in forum Forced Induction
    Replies: 6
    Last Post: 02-16-2007, 06:13 PM
  5. Rear Mount Turbo in the 7's
    By JD_Z28 in forum Multimedia Section
    Replies: 11
    Last Post: 09-13-2006, 01:19 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •