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e170drvr's Avatar
 
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any boost in 1st?

I know that there isn't much load on the engine, but do you guys get much boost in first gear (4spd)? I recently installed my K27 and muffler, stock headers. I can barely get the needle off the peg in first. in second in comes up but lags a lot, third comes up pretty good. Just wondering if I have a leak somewhere in the ic plumbing, and what are the common leaks in the plumbing? The car is just a complete dog at a stoplight. Sucks being blown off the line by a pickup!!! I read on the board about guys having trouble not burning up their tires, I don't think I could spin them if I tried. What mods can I do to bump the low end performance? I have K27S, 1 bar spring, fabspeed muffler, and Andial IC. Any thoughts?

Eric
87 930 Beautiful, but runs crappy!
Old 04-25-2007, 07:52 PM
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I get pretty good boost in first,, but have to really step on it and hit 2500 rpm or so..
I"ve never burned my rear tires,, don't want to dump the clutch that hard.
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Old 04-25-2007, 09:42 PM
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When I had CIS and mods, my car would break the tires loose when the boost came on in 1st. Sounds like you have a problem.
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Old 04-26-2007, 04:35 AM
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I agree...

I have plenty of boost in first gear.
Recently put on a K27 7200, but I had lots with the 3LDZ too.....
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Old 04-26-2007, 05:43 AM
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Yes, I get boost in first gear. All I can say is that things happen VERY quickly in fist gear! I hate to take my eyes off the road to glance at my boost gauge, but I know it's boosting.
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Old 04-26-2007, 06:16 AM
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Don't feel bad, my wife beats me off the line in her Nissan Armada(a pretty quick SUV), but it is only for about 40-50 feet. Most any automatic car or even many manuals are going to beat me for the 1st. few feet because I have no boost and walk the car off the line.

That does not explain your problem though. I think you have a BIG boost leak somewhere. Here is how my car behaves and I think it is typical for a lightly modded 930:

Nothing up through first part of first gear...THEN....big boost and tires break loose pretty good and car will start to get loose side to side until you let off. If I wanted to, I could do a pretty good muscle car style burnout. If I hammer it the tires will chirp and break free a little on the 1st to 2nd shift as well.

Could probably get boost earlier and spin them right off the line, but as I indicated, I baby it off the line until I slam it down.
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Last edited by F350Lawman; 04-26-2007 at 07:22 AM..
Old 04-26-2007, 07:05 AM
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Thanks guys, would bad BOV seals explain any of this? these are about the only seals I haven't checked.

Eric
Old 04-26-2007, 07:44 AM
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Eric,
It might be your gearing. I don't get any boost in 1st gear because of my low gearing. The engine is redlines so quickly in first gear the turbo doesn't have a chance to spool up, plus turbo output (boost) is a function of exhaust gas velocity and EGT's. Temp's don't go up that much if the load is low because of numerical gearing.
If you are in second or third gear and your boost gauge max's out at the wastegate boost cutout level, you're ok.

If you're using the stock header system, you are going to see the lag you mention. The headers are too long for fast turbo spool up. I think your turbo is over matched for the header system in your car. Also, are you using the factory 930 cams in your car? These cams are pretty mild cams compared to the SC, 964 cams.
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Last edited by WERK I; 04-26-2007 at 08:05 AM..
Old 04-26-2007, 08:01 AM
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Is your distributer advance plate seized?

When I bought my car it behaved the same as yours (similar mods to yours). I noticed a thread discussing the advance plate in the distributer needing to be disassembled because the grease hardens with time. The grease in mine was so hard I was unable to get the advance plate to move. Do a search for an exploded diagram of the distributer to see the advance plate. If it's stuck in the retarded position you'll be missing about 9 degrees of ignition timing making it a dog off the line.
Old 04-26-2007, 08:25 AM
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Eric,

When I bought my car in '92 it exhibited the same symptoms as your describing but at the time I thought it was normal. It wasn't until I brought it to AJ Racing (San Diego) to have some Bilsteins installed was I informed by their techs after test driving my car my engine wasn't behaving as it should....they found my wastegate was binding a little.

They fixed it for free and wow what a difference it made (my car was completely stock at the time).

I hope you find your problem.

Alex
Old 04-26-2007, 08:42 PM
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Bought my car with a '78 RoW 930 motor, 8:0.1 C/R, SC cams, stock turbo, wastegate, CIS and headers, mated to a '77 915.

It'd hit boost in 1st around 3500-4000 or so - you didn't generally want that, because it'd redline almost instantly and hooking 2nd was a better way to go fast(er).

A mild 930 will boost quite hard on a 915 1st gear, which is way lower than a 4-speed 930 1st - an open wastegate dump pipe leaves you in no doubt at all.

Can't tell you exactly how much boost though, because you don't tend to look at the gauges when 150 ponies you weren't expecting make a grand entrance...
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Old 04-27-2007, 03:56 AM
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Thank you for the replies guys, I have been out of town, and just now able to tinker with the car. I followed up on all of your suggestions, hoping to find the problem. I replaced all the ic seals O rings etc that I could get my hands on, including the BOV at either end of the piston. Didn't find any problems and no improvement. Also checked the wastegate as per Bolt, removed it and found the valve to be sealing properly, and confirmed by no exhaust coming out of the wastegate dump pipe. What I did find was that the vacuum advance unit was damaged by the po, probably when dropping engine to replace the clutch. The stem metal stem coming from the right side of the pot (advance?) was broken, and someone had done a crappy job repairing it. the opening was full of rust. After trying to clean it, I cannot get it to function using the old suck test. I am pretty sure the unit is kaput. I have ordered a new unit to replace it, and have some questions. A. I am really confused about the operation of this system. My car is an 87 with two ports to the vacuum unit. the port to the right ( i believe this is the advance side) connects to a switch of some kind mounted to the BOV manifold, then works its way toward the TB. The other side goes up toward the top of the case. then down to the TB. When I hook a vacuum meter to the advance side (right nearest fan) I get 14 in hg with a warm engine and drops when advancing the throttle. the other side doesn't seem to produce any vacuum warm or cold. is this condition normal? B. will a properly functioning Vacuum unit give me a noticeable improvement in performance? C. is the unit difficult to replace? I read a post recently that explained in great detail how all this stuff works (with pics) I think Rarly made the post, but can't for the life of me find it. Sorry about the novel here, and I appreciate all the help.

Eric
Old 05-19-2007, 09:42 AM
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