Tohatsu/Nissan TLDI motors

[johnbrewster]

Is anyone aware of reliability problems with the TLDIs? If they are as good as their predecessors they would seem like a pretty good bet. A follow-up question concerns the 70 vs 90 HP TLDIs. Their published specs, (except for gear ratio) are identical so what accounts for the 20 HP difference? Would a 70 perform any better than the 90 at low or mid RPMs? If not, why would anyone get a 70 other than to save a thousand bucks?

 

[ICEMAN]

Re: Tohatsu/Nissan TLDI motors

I currently service two 90 TLDI Nissans. Other than routine maintenance, I have "not" had to do anything else on them. They have been reliable for two seasons. At this time I do not have a parts book for the 70 TLDI to see if there are differences in the injection system, to make up the 20 horsepower difference, but I would guess there is. Horsepower is rated at the prop and there are numerous ways to alter certain components and systems to increase horsepower output. The powerhead may be indentical, but altering the fuel supply system and the ignition system, along with changing gear ratios in the lower unit, could increase horsepower output. As far as why someone may be getting a 70 or 90 hp outboard is based on numerous reasons. What's the max. hp for the boat? How much do they want to spend? What are they using the boat for? Body of water have hp restrictions? Hope this helps

 

[johnbrewster]

Re: Tohatsu/Nissan TLDI motors

Hi Iceman,<br /><br />Thanks for the post. I asked Tohatsu the question about how come the 70 had the same specs as the 90 but 20 less HP and their response was that the detuning was done in the ECU. Pretty much in line with what you suggested. The way I see it, the Tohatsu/Nissan 70 motors will probably give you the low and mid range torque of the 90 but only the top speed of a 70. This could be a nice advantage over other 70s but at 300+ pounds it is a little heavy for a 70 HP two-stroke. However, it may still be the lightest two-stroke 70 that has good fuel economy and meets the 2006 EPA standards.