1HDT power upgrade

Submitted: Wednesday, Feb 07, 2007 at 10:44
ThreadID: 42075 Views:13952 Replies:5 FollowUps:2
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Morning all,

Looking at upgrading the Navara to a 1HDT 80 series and hoping for a bit of feedback. I've heard good things about these motors (barring big end bearings), all be it that they are a bit gutless pre turbo kicking in. Spoke to AXT turbo recently who advised against intercooling them, and instead replacing factory turbo with larger garrett job. He believed far better power increase for similar investment. Hoping someone may have done a similar upgrade?
The other option is buying a low km 1hz 80 and doing the turbo kit in full. The 1HDT appeals a bit more to me as the fuel pump has the factory boost compensator. AXT are talking about 20% improvement with garrett unit.
Look forward to hearing your replies.

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Reply By: 93 Navara - Wednesday, Feb 07, 2007 at 11:09

Wednesday, Feb 07, 2007 at 11:09
Forgot to add, do the autos have issues? Will be towig off road Jayco unit, about 11-1200 kg
AnswerID: 220364

Reply By: XLGXL - Wednesday, Feb 07, 2007 at 11:36

Wednesday, Feb 07, 2007 at 11:36
I own a 1HDT that has been water to air intercooled (Denco) it has been the best thing I have done for a constant power increase. I'm surprised why AXT would advise you not to intercool this motor?
AnswerID: 220371

Follow Up By: 93 Navara - Wednesday, Feb 07, 2007 at 12:53

Wednesday, Feb 07, 2007 at 12:53
Sorry, should have explained. Not an issue with intercooling, simply greater power increase from new turbo than ntercooling for only slightly more dollars.
FollowupID: 480947

Follow Up By: Member - DOZER- Wednesday, Feb 07, 2007 at 20:48

Wednesday, Feb 07, 2007 at 20:48
If your chasing greater power, remember, speed is expensive...how fast do u want to go?? The larger turbo will give you more top end power,and more lag down low the intercooler will give you power across the whole rev range, and will make your engine last longer with less thermal stress....alot better...the pump boost compensator is the cause of the low down lag, get the pump tweaked up with an intercooler and you wont look back. A turbo from the supra is a good cheap alternative to a garrett, with a garret, you will need an adapter or a new manifold..with the supra or later hdft turbo (which is slightly bigger than hdt's) they bolt straight on.
A 3 inch exhaust is a good improvement aswell.
FollowupID: 481052

Reply By: Member - Shane D (QLD) - Wednesday, Feb 07, 2007 at 18:20

Wednesday, Feb 07, 2007 at 18:20
forget getting a 1HZ
given the chance I would go the 1HDT,they are direct injection for a start and will give better fuel economy
I've owned a 1HDT 80 and now own a 1HZ 100, this is IMHO
AnswerID: 220440

Reply By: luch - Wednesday, Feb 07, 2007 at 18:26

Wednesday, Feb 07, 2007 at 18:26
My parents have a 80 series with the 1HD-T, Auto transmission
Fuel Economy highway run is 8.6 km/litre (100km/h)
Has good power through the rev range

These motors put out 115kw standard

My old 1HZ turbo 80 series was around 130 - 135kw
Fuel economy 7.5 - 8.0 km/litre (sometimes 8.6km/l)

You can get boost compensator fitted to the 1HZ motors i think the cost is around $1200, The only job they perform is to reduce black smoke. They may give slightly better economy
AnswerID: 220443

Reply By: 93 Navara - Wednesday, Mar 07, 2007 at 18:28

Wednesday, Mar 07, 2007 at 18:28
Thanks all for your feedback.

Just bought a 90 1hdt model. 360k, but reco, new turbo and injection pump done 15k ago. $11k I don't have to worry about putting up for. Small problem with front diff or axles as fair bit of feedback in the driveline when accelerating or decelerating quickly. Hopefully will have it all sorted out soon and look foward to getting out in it. Thanks again for your thoughts.

(formerly 93 navara!!)
AnswerID: 225884

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