Fixmyvw.com

Author Topic: First Time Rebuild Advice  (Read 5162 times)

Reply #15August 15, 2012, 11:09:57 pm

whoabeats

  • User+

  • Offline
  • *

  • 38
Re: First Time Rebuild Advice
« Reply #15 on: August 15, 2012, 11:09:57 pm »
I'm building an AHU with a LR 300TDi pump, what are they like in comparison?
Also how do you plan on attaching the turbo? i got my GT20 off an A4 2.5TDi over here for £60, but they're not a straight fit on any manifolds as far as i know. As such i'll be making an adaptor from a trapezoid 4 bolt manifold to the rectangular 4 bolt Garrett flange. If you want a pair of flanges, or the CAD drawings for them, let me know. will be getting them laser cut in work soon. Also curious as to how you intend to control it. I've a method in mind but have no idea how it'll perform in day to day driving to be honest

I am actually leaning more towards a non vgt turbo at this point and getting a traditional wastegated unit. Not entirely sure yet though. As far as manifold I plan to run a cast turbo 8v manifold from ebay. http://www.ebay.com/itm/VW-8V-CAST-IRON-TURBO-EXHAUST-MANIFOLD-GOLF-JETTA-PASSAT-BEETLE-CABRIO-MK3-T3-/280939833590?pt=Motors_Car_Truck_Parts_Accessories&hash=item416951a8f6&vxp=mtr#ht_1651wt_1037

And while I do trust genuine bosch parts. I'd rather take it easy with expensive pumps. Especially on interference timing belt engines. That part always makes me nervous.
I have a diesel hot-rod addiction
97 2500 cummins 4x4 5 speed 460hp
98 AHU m-tdi being built for a car I dont own
00 ALH TDI handles like a race car, but has no balls

Reply #16August 15, 2012, 11:57:43 pm

libbydiesel

  • Global Moderator
  • Veteran

  • Offline
  • *****

  • 3416
Re: First Time Rebuild Advice
« Reply #16 on: August 15, 2012, 11:57:43 pm »
If the plunger seizes it won't do anything to the timing belt.  The plunger will snap before the engine jumps time.  All that happens is the engine stops running.  It doesn't cause damage outside the pump.

Reply #17August 16, 2012, 11:26:10 am

whoabeats

  • User+

  • Offline
  • *

  • 38
Re: First Time Rebuild Advice
« Reply #17 on: August 16, 2012, 11:26:10 am »
I guess that makes sense because why would the plunger stop the rotating assembly of the pump? I dont know, I know timing belts are pretty tough and they are nice because they are quiet, but having everything timed with gears just lets me sleep good at night haha.

So to those people that have seized a pump what happens? The engine just loses capability to maintain rpms and eventually stalls out? Im picturing much more catastrophic things in my head  :o
I have a diesel hot-rod addiction
97 2500 cummins 4x4 5 speed 460hp
98 AHU m-tdi being built for a car I dont own
00 ALH TDI handles like a race car, but has no balls

Reply #18August 16, 2012, 06:40:56 pm

snakemaster

  • Veteran

  • Offline
  • ***

  • 405
Re: First Time Rebuild Advice
« Reply #18 on: August 16, 2012, 06:40:56 pm »
I guess that makes sense because why would the plunger stop the rotating assembly of the pump? I dont know, I know timing belts are pretty tough and they are nice because they are quiet, but having everything timed with gears just lets me sleep good at night haha.

So to those people that have seized a pump what happens? The engine just loses capability to maintain rpms and eventually stalls out? Im picturing much more catastrophic things in my head  :o
the engine just stops like you have turned of the key as it can not pump any fuel to the injectors  , what power you looking for out of your build
Glenmorangie  single highland malt

Reply #19August 17, 2012, 07:59:17 am

whoabeats

  • User+

  • Offline
  • *

  • 38
Re: First Time Rebuild Advice
« Reply #19 on: August 17, 2012, 07:59:17 am »
I'd like to get the max I can without worrying about the stock bottom end. I dont want to throw in the added cost of rosten rods or a girdle at this time. So what does that put me at 230hp maybe 250hp? I am definitely considering getting the pistons machined down so that I can safely throw a little more boost at it. I also plan to do water/methanol injection so I will have high peak cylinder pressures. Hopefully a lower cr will help with that as well. At some point depending on what people who have done it think, I will want a cam and possibly valve train upgrades.
I have a diesel hot-rod addiction
97 2500 cummins 4x4 5 speed 460hp
98 AHU m-tdi being built for a car I dont own
00 ALH TDI handles like a race car, but has no balls

Reply #20August 18, 2012, 05:03:22 pm

Smokey Eddy

  • Veteran

  • Offline
  • ***

  • 3468
    • McScrubbins Body Wash
Re: First Time Rebuild Advice
« Reply #20 on: August 18, 2012, 05:03:22 pm »
Lurkers are required to wait 48 hours before getting a response are they not?  Once a contributing member then penalty time is reduce per post.

This is true.
Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD

Reply #21August 19, 2012, 01:20:52 pm

RabbitJockey

  • Veteran

  • Offline
  • ***

  • 5061
  • Personal Text
    America, DUCK YEAH!!!
Re: First Time Rebuild Advice
« Reply #21 on: August 19, 2012, 01:20:52 pm »
IMO u should do the rods to make 230-250hp on a tdi it puts a lot of stress on those parts because all the power is in the lower rpms
01 Jetta TDI 100% stock daily
81 Rabbit:TDI-M ported head, Frank06 cam, PD intake, hybrid T3 turbo, Renault intercooler, Syl20 11mm pump, light weight fw, and yellow California Clutch clutch kit

Reply #22August 19, 2012, 01:54:46 pm

whoabeats

  • User+

  • Offline
  • *

  • 38
Re: First Time Rebuild Advice
« Reply #22 on: August 19, 2012, 01:54:46 pm »
Well maybe I just need to aim at a lower power level. I just cant justify all that money yet. Because if I do rods I might as well do a girdle and some other stuff too. And I just bought a prefabbed garage and am working on buying my first home. I have driven an alh that only had a good exhaust, small nozzles (slightly bigger than stock), and a mild tune and I was happy with the power. There is no reason my big pump, big sticks, exhaust, big turbo cant feel like a speed demon compared to that and by using a bigger turbo it will have a little more boost lag and cause a lot less stress on the bottom end. At least that is the plan.
I have a diesel hot-rod addiction
97 2500 cummins 4x4 5 speed 460hp
98 AHU m-tdi being built for a car I dont own
00 ALH TDI handles like a race car, but has no balls